Home / 85,428.10-128,142.15-81,151.30

Finding the Fourth Proportional to 85,428.10, 128,142.15 and 81,151.30

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Solution

The fourth proportional to 85,428.10, 128,142.15 and 81,151.30 is: 121,726.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,428.10 : 128,142.15 = 81,151.30 : x
  2. Step 2: Convert to fraction form
    85,428.10/128,142.15 = 81,151.30/x
  3. Step 3: Cross multiply
    85,428.10x = 128,142.15 × 81,151.30
  4. Step 4: Simplify right side
    85,428.10x = 10,398,902,057.30
  5. Step 5: Solve for x
    x = 10,398,902,057.30/85,428.10
  6. Step 6: Final answer
    x = 121,726.95

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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.