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Finding the Fourth Proportional to 121,920, 168,318.72 and 92,060.16

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Solution

The fourth proportional to 121,920, 168,318.72 and 92,060.16 is: 127,095.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,920 : 168,318.72 = 92,060.16 : x
  2. Step 2: Convert to fraction form
    121,920/168,318.72 = 92,060.16/x
  3. Step 3: Cross multiply
    121,920x = 168,318.72 × 92,060.16
  4. Step 4: Simplify right side
    121,920x = 15,495,448,294.20
  5. Step 5: Solve for x
    x = 15,495,448,294.20/121,920
  6. Step 6: Final answer
    x = 127,095.21

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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.