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Finding the Fourth Proportional to 123,108.81, 169,890.12 and 66,520.20

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Solution

The fourth proportional to 123,108.81, 169,890.12 and 66,520.20 is: 91,797.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,108.81 : 169,890.12 = 66,520.20 : x
  2. Step 2: Convert to fraction form
    123,108.81/169,890.12 = 66,520.20/x
  3. Step 3: Cross multiply
    123,108.81x = 169,890.12 × 66,520.20
  4. Step 4: Simplify right side
    123,108.81x = 11,301,124,760.42
  5. Step 5: Solve for x
    x = 11,301,124,760.42/123,108.81
  6. Step 6: Final answer
    x = 91,797.86

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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.