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Finding the Fourth Proportional to 156,398.72, 215,831.59 and 84,779.93

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Solution

The fourth proportional to 156,398.72, 215,831.59 and 84,779.93 is: 116,997.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    156,398.72 : 215,831.59 = 84,779.93 : x
  2. Step 2: Convert to fraction form
    156,398.72/215,831.59 = 84,779.93/x
  3. Step 3: Cross multiply
    156,398.72x = 215,831.59 × 84,779.93
  4. Step 4: Simplify right side
    156,398.72x = 18,298,187,419.62
  5. Step 5: Solve for x
    x = 18,298,187,419.62/156,398.72
  6. Step 6: Final answer
    x = 116,997.04

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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.