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Finding the Fourth Proportional to 156,139.76, 215,471.66 and 84,520.64

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Solution

The fourth proportional to 156,139.76, 215,471.66 and 84,520.64 is: 116,637.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    156,139.76 : 215,471.66 = 84,520.64 : x
  2. Step 2: Convert to fraction form
    156,139.76/215,471.66 = 84,520.64/x
  3. Step 3: Cross multiply
    156,139.76x = 215,471.66 × 84,520.64
  4. Step 4: Simplify right side
    156,139.76x = 18,211,802,605.06
  5. Step 5: Solve for x
    x = 18,211,802,605.06/156,139.76
  6. Step 6: Final answer
    x = 116,637.83

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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.