Home / 120,135.29-165,780-66,417.17

Finding the Fourth Proportional to 120,135.29, 165,780 and 66,417.17

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Solution

The fourth proportional to 120,135.29, 165,780 and 66,417.17 is: 91,651.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,135.29 : 165,780 = 66,417.17 : x
  2. Step 2: Convert to fraction form
    120,135.29/165,780 = 66,417.17/x
  3. Step 3: Cross multiply
    120,135.29x = 165,780 × 66,417.17
  4. Step 4: Simplify right side
    120,135.29x = 11,010,637,613.70
  5. Step 5: Solve for x
    x = 11,010,637,613.70/120,135.29
  6. Step 6: Final answer
    x = 91,651.99

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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.