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Finding the Fourth Proportional to 72,966.60, 100,693.92 and 39,432.60

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Solution

The fourth proportional to 72,966.60, 100,693.92 and 39,432.60 is: 54,416.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,966.60 : 100,693.92 = 39,432.60 : x
  2. Step 2: Convert to fraction form
    72,966.60/100,693.92 = 39,432.60/x
  3. Step 3: Cross multiply
    72,966.60x = 100,693.92 × 39,432.60
  4. Step 4: Simplify right side
    72,966.60x = 3,970,623,069.79
  5. Step 5: Solve for x
    x = 3,970,623,069.79/72,966.60
  6. Step 6: Final answer
    x = 54,416.99

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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.