Home / 72,921.20-100,631.25-39,387.20

Finding the Fourth Proportional to 72,921.20, 100,631.25 and 39,387.20

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Solution

The fourth proportional to 72,921.20, 100,631.25 and 39,387.20 is: 54,354.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,921.20 : 100,631.25 = 39,387.20 : x
  2. Step 2: Convert to fraction form
    72,921.20/100,631.25 = 39,387.20/x
  3. Step 3: Cross multiply
    72,921.20x = 100,631.25 × 39,387.20
  4. Step 4: Simplify right side
    72,921.20x = 3,963,582,666.84
  5. Step 5: Solve for x
    x = 3,963,582,666.84/72,921.20
  6. Step 6: Final answer
    x = 54,354.33

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.