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Finding the Fourth Proportional to 122,702.78, 169,329.63 and 68,987.90

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Solution

The fourth proportional to 122,702.78, 169,329.63 and 68,987.90 is: 95,203.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    122,702.78 : 169,329.63 = 68,987.90 : x
  2. Step 2: Convert to fraction form
    122,702.78/169,329.63 = 68,987.90/x
  3. Step 3: Cross multiply
    122,702.78x = 169,329.63 × 68,987.90
  4. Step 4: Simplify right side
    122,702.78x = 11,681,695,581.48
  5. Step 5: Solve for x
    x = 11,681,695,581.48/122,702.78
  6. Step 6: Final answer
    x = 95,203.19

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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.