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Finding the Fourth Proportional to 71,720.66, 98,976.65 and 39,891.57

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Solution

The fourth proportional to 71,720.66, 98,976.65 and 39,891.57 is: 55,051.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,720.66 : 98,976.65 = 39,891.57 : x
  2. Step 2: Convert to fraction form
    71,720.66/98,976.65 = 39,891.57/x
  3. Step 3: Cross multiply
    71,720.66x = 98,976.65 × 39,891.57
  4. Step 4: Simplify right side
    71,720.66x = 3,948,333,762.38
  5. Step 5: Solve for x
    x = 3,948,333,762.38/71,720.66
  6. Step 6: Final answer
    x = 55,051.56

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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.