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Finding the Fourth Proportional to 121,567.97, 167,852.69 and 78,572.90

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Solution

The fourth proportional to 121,567.97, 167,852.69 and 78,572.90 is: 108,488.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,567.97 : 167,852.69 = 78,572.90 : x
  2. Step 2: Convert to fraction form
    121,567.97/167,852.69 = 78,572.90/x
  3. Step 3: Cross multiply
    121,567.97x = 167,852.69 × 78,572.90
  4. Step 4: Simplify right side
    121,567.97x = 13,188,672,947.52
  5. Step 5: Solve for x
    x = 13,188,672,947.52/121,567.97
  6. Step 6: Final answer
    x = 108,488.06

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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.