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Finding the Fourth Proportional to 120,134.88, 165,782.88 and 66,422.16

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Solution

The fourth proportional to 120,134.88, 165,782.88 and 66,422.16 is: 91,660.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,134.88 : 165,782.88 = 66,422.16 : x
  2. Step 2: Convert to fraction form
    120,134.88/165,782.88 = 66,422.16/x
  3. Step 3: Cross multiply
    120,134.88x = 165,782.88 × 66,422.16
  4. Step 4: Simplify right side
    120,134.88x = 11,011,656,980.62
  5. Step 5: Solve for x
    x = 11,011,656,980.62/120,134.88
  6. Step 6: Final answer
    x = 91,660.78

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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.