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Finding the Fourth Proportional to 156,355.86, 215,691.78 and 98,898.40

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Solution

The fourth proportional to 156,355.86, 215,691.78 and 98,898.40 is: 136,429.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    156,355.86 : 215,691.78 = 98,898.40 : x
  2. Step 2: Convert to fraction form
    156,355.86/215,691.78 = 98,898.40/x
  3. Step 3: Cross multiply
    156,355.86x = 215,691.78 × 98,898.40
  4. Step 4: Simplify right side
    156,355.86x = 21,331,571,935.15
  5. Step 5: Solve for x
    x = 21,331,571,935.15/156,355.86
  6. Step 6: Final answer
    x = 136,429.63

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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.