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Finding the Fourth Proportional to 71,520.66, 98,696.88 and 39,688.92

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Solution

The fourth proportional to 71,520.66, 98,696.88 and 39,688.92 is: 54,769.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,520.66 : 98,696.88 = 39,688.92 : x
  2. Step 2: Convert to fraction form
    71,520.66/98,696.88 = 39,688.92/x
  3. Step 3: Cross multiply
    71,520.66x = 98,696.88 × 39,688.92
  4. Step 4: Simplify right side
    71,520.66x = 3,917,172,574.57
  5. Step 5: Solve for x
    x = 3,917,172,574.57/71,520.66
  6. Step 6: Final answer
    x = 54,769.80

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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.