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Finding the Fourth Proportional to 156,641.78, 216,147.68 and 87,721.63

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Solution

The fourth proportional to 156,641.78, 216,147.68 and 87,721.63 is: 121,045.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    156,641.78 : 216,147.68 = 87,721.63 : x
  2. Step 2: Convert to fraction form
    156,641.78/216,147.68 = 87,721.63/x
  3. Step 3: Cross multiply
    156,641.78x = 216,147.68 × 87,721.63
  4. Step 4: Simplify right side
    156,641.78x = 18,960,825,831.34
  5. Step 5: Solve for x
    x = 18,960,825,831.34/156,641.78
  6. Step 6: Final answer
    x = 121,045.78

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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.