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Finding the Fourth Proportional to 71,636.88, 98,859.88 and 39,805.20

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Solution

The fourth proportional to 71,636.88, 98,859.88 and 39,805.20 is: 54,931.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,636.88 : 98,859.88 = 39,805.20 : x
  2. Step 2: Convert to fraction form
    71,636.88/98,859.88 = 39,805.20/x
  3. Step 3: Cross multiply
    71,636.88x = 98,859.88 × 39,805.20
  4. Step 4: Simplify right side
    71,636.88x = 3,935,137,295.38
  5. Step 5: Solve for x
    x = 3,935,137,295.38/71,636.88
  6. Step 6: Final answer
    x = 54,931.72

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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.