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Finding the Fourth Proportional to 71,729.84, 98,986.88 and 39,898.74

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Solution

The fourth proportional to 71,729.84, 98,986.88 and 39,898.74 is: 55,060.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,729.84 : 98,986.88 = 39,898.74 : x
  2. Step 2: Convert to fraction form
    71,729.84/98,986.88 = 39,898.74/x
  3. Step 3: Cross multiply
    71,729.84x = 98,986.88 × 39,898.74
  4. Step 4: Simplify right side
    71,729.84x = 3,949,451,888.28
  5. Step 5: Solve for x
    x = 3,949,451,888.28/71,729.84
  6. Step 6: Final answer
    x = 55,060.10

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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.