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Finding the Fourth Proportional to 72,921.75, 100,632.08 and 39,387.75

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Solution

The fourth proportional to 72,921.75, 100,632.08 and 39,387.75 is: 54,355.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,921.75 : 100,632.08 = 39,387.75 : x
  2. Step 2: Convert to fraction form
    72,921.75/100,632.08 = 39,387.75/x
  3. Step 3: Cross multiply
    72,921.75x = 100,632.08 × 39,387.75
  4. Step 4: Simplify right side
    72,921.75x = 3,963,671,209.02
  5. Step 5: Solve for x
    x = 3,963,671,209.02/72,921.75
  6. Step 6: Final answer
    x = 54,355.13

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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.