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Finding the Fourth Proportional to 85,930.80, 128,884.86 and 33,313.20

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Solution

The fourth proportional to 85,930.80, 128,884.86 and 33,313.20 is: 49,965.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,930.80 : 128,884.86 = 33,313.20 : x
  2. Step 2: Convert to fraction form
    85,930.80/128,884.86 = 33,313.20/x
  3. Step 3: Cross multiply
    85,930.80x = 128,884.86 × 33,313.20
  4. Step 4: Simplify right side
    85,930.80x = 4,293,567,118.15
  5. Step 5: Solve for x
    x = 4,293,567,118.15/85,930.80
  6. Step 6: Final answer
    x = 49,965.40

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.