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Finding the Fourth Proportional to 85,645.40, 128,468.10 and 30,234.20

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Solution

The fourth proportional to 85,645.40, 128,468.10 and 30,234.20 is: 45,351.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,645.40 : 128,468.10 = 30,234.20 : x
  2. Step 2: Convert to fraction form
    85,645.40/128,468.10 = 30,234.20/x
  3. Step 3: Cross multiply
    85,645.40x = 128,468.10 × 30,234.20
  4. Step 4: Simplify right side
    85,645.40x = 3,884,130,229.02
  5. Step 5: Solve for x
    x = 3,884,130,229.02/85,645.40
  6. Step 6: Final answer
    x = 45,351.30

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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.