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Finding the Fourth Proportional to 121,572.78, 167,798.43 and 71,287.98

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Solution

The fourth proportional to 121,572.78, 167,798.43 and 71,287.98 is: 98,393.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,572.78 : 167,798.43 = 71,287.98 : x
  2. Step 2: Convert to fraction form
    121,572.78/167,798.43 = 71,287.98/x
  3. Step 3: Cross multiply
    121,572.78x = 167,798.43 × 71,287.98
  4. Step 4: Simplify right side
    121,572.78x = 11,962,011,121.87
  5. Step 5: Solve for x
    x = 11,962,011,121.87/121,572.78
  6. Step 6: Final answer
    x = 98,393.83

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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.