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Finding the Fourth Proportional to 85,390.80, 128,086.20 and 55,899.60

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Solution

The fourth proportional to 85,390.80, 128,086.20 and 55,899.60 is: 83,849.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,390.80 : 128,086.20 = 55,899.60 : x
  2. Step 2: Convert to fraction form
    85,390.80/128,086.20 = 55,899.60/x
  3. Step 3: Cross multiply
    85,390.80x = 128,086.20 × 55,899.60
  4. Step 4: Simplify right side
    85,390.80x = 7,159,967,345.52
  5. Step 5: Solve for x
    x = 7,159,967,345.52/85,390.80
  6. Step 6: Final answer
    x = 83,849.40

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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.