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Finding the Fourth Proportional to 156,930.70, 216,543.15 and 100,301.90

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Solution

The fourth proportional to 156,930.70, 216,543.15 and 100,301.90 is: 138,403.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    156,930.70 : 216,543.15 = 100,301.90 : x
  2. Step 2: Convert to fraction form
    156,930.70/216,543.15 = 100,301.90/x
  3. Step 3: Cross multiply
    156,930.70x = 216,543.15 × 100,301.90
  4. Step 4: Simplify right side
    156,930.70x = 21,719,689,376.99
  5. Step 5: Solve for x
    x = 21,719,689,376.99/156,930.70
  6. Step 6: Final answer
    x = 138,403.06

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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.