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Finding the Fourth Proportional to 72,962.75, 100,688.60 and 39,428.75

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Solution

The fourth proportional to 72,962.75, 100,688.60 and 39,428.75 is: 54,411.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,962.75 : 100,688.60 = 39,428.75 : x
  2. Step 2: Convert to fraction form
    72,962.75/100,688.60 = 39,428.75/x
  3. Step 3: Cross multiply
    72,962.75x = 100,688.60 × 39,428.75
  4. Step 4: Simplify right side
    72,962.75x = 3,970,025,637.25
  5. Step 5: Solve for x
    x = 3,970,025,637.25/72,962.75
  6. Step 6: Final answer
    x = 54,411.68

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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.