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Finding the Fourth Proportional to 156,409.70, 215,929.13 and 122,345.80

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Solution

The fourth proportional to 156,409.70, 215,929.13 and 122,345.80 is: 168,902.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    156,409.70 : 215,929.13 = 122,345.80 : x
  2. Step 2: Convert to fraction form
    156,409.70/215,929.13 = 122,345.80/x
  3. Step 3: Cross multiply
    156,409.70x = 215,929.13 × 122,345.80
  4. Step 4: Simplify right side
    156,409.70x = 26,418,022,153.15
  5. Step 5: Solve for x
    x = 26,418,022,153.15/156,409.70
  6. Step 6: Final answer
    x = 168,902.71

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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.