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Finding the Fourth Proportional to 120,128.66, 165,789.65 and 66,417.76

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Solution

The fourth proportional to 120,128.66, 165,789.65 and 66,417.76 is: 91,663.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,128.66 : 165,789.65 = 66,417.76 : x
  2. Step 2: Convert to fraction form
    120,128.66/165,789.65 = 66,417.76/x
  3. Step 3: Cross multiply
    120,128.66x = 165,789.65 × 66,417.76
  4. Step 4: Simplify right side
    120,128.66x = 11,011,377,184.18
  5. Step 5: Solve for x
    x = 11,011,377,184.18/120,128.66
  6. Step 6: Final answer
    x = 91,663.20

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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.