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Finding the Fourth Proportional to 122,641.60, 169,230.72 and 68,920

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Solution

The fourth proportional to 122,641.60, 169,230.72 and 68,920 is: 95,101.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    122,641.60 : 169,230.72 = 68,920 : x
  2. Step 2: Convert to fraction form
    122,641.60/169,230.72 = 68,920/x
  3. Step 3: Cross multiply
    122,641.60x = 169,230.72 × 68,920
  4. Step 4: Simplify right side
    122,641.60x = 11,663,381,222.40
  5. Step 5: Solve for x
    x = 11,663,381,222.40/122,641.60
  6. Step 6: Final answer
    x = 95,101.35

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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.