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Finding the Fourth Proportional to 71,984.80, 99,312.78 and 45,128.44

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Solution

The fourth proportional to 71,984.80, 99,312.78 and 45,128.44 is: 62,260.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,984.80 : 99,312.78 = 45,128.44 : x
  2. Step 2: Convert to fraction form
    71,984.80/99,312.78 = 45,128.44/x
  3. Step 3: Cross multiply
    71,984.80x = 99,312.78 × 45,128.44
  4. Step 4: Simplify right side
    71,984.80x = 4,481,830,833.46
  5. Step 5: Solve for x
    x = 4,481,830,833.46/71,984.80
  6. Step 6: Final answer
    x = 62,260.79

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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.