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Finding the Fourth Proportional to 156,139.70, 215,472.87 and 84,520.31

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Solution

The fourth proportional to 156,139.70, 215,472.87 and 84,520.31 is: 116,638.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    156,139.70 : 215,472.87 = 84,520.31 : x
  2. Step 2: Convert to fraction form
    156,139.70/215,472.87 = 84,520.31/x
  3. Step 3: Cross multiply
    156,139.70x = 215,472.87 × 84,520.31
  4. Step 4: Simplify right side
    156,139.70x = 18,211,832,691.63
  5. Step 5: Solve for x
    x = 18,211,832,691.63/156,139.70
  6. Step 6: Final answer
    x = 116,638.07

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1.5x scale

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.