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Finding the Fourth Proportional to 71,798.64, 99,079.80 and 39,966.48

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Solution

The fourth proportional to 71,798.64, 99,079.80 and 39,966.48 is: 55,152.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,798.64 : 99,079.80 = 39,966.48 : x
  2. Step 2: Convert to fraction form
    71,798.64/99,079.80 = 39,966.48/x
  3. Step 3: Cross multiply
    71,798.64x = 99,079.80 × 39,966.48
  4. Step 4: Simplify right side
    71,798.64x = 3,959,870,845.10
  5. Step 5: Solve for x
    x = 3,959,870,845.10/71,798.64
  6. Step 6: Final answer
    x = 55,152.45

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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.