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Finding the Fourth Proportional to 121,170.52, 167,242.89 and 78,655.24

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Solution

The fourth proportional to 121,170.52, 167,242.89 and 78,655.24 is: 108,562.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,170.52 : 167,242.89 = 78,655.24 : x
  2. Step 2: Convert to fraction form
    121,170.52/167,242.89 = 78,655.24/x
  3. Step 3: Cross multiply
    121,170.52x = 167,242.89 × 78,655.24
  4. Step 4: Simplify right side
    121,170.52x = 13,154,529,651.24
  5. Step 5: Solve for x
    x = 13,154,529,651.24/121,170.52
  6. Step 6: Final answer
    x = 108,562.13

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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.