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Finding the Fourth Proportional to 410.78, 616.21 and 136.77

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Solution

The fourth proportional to 410.78, 616.21 and 136.77 is: 205.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    410.78 : 616.21 = 136.77 : x
  2. Step 2: Convert to fraction form
    410.78/616.21 = 136.77/x
  3. Step 3: Cross multiply
    410.78x = 616.21 × 136.77
  4. Step 4: Simplify right side
    410.78x = 84,278.70
  5. Step 5: Solve for x
    x = 84,278.70/410.78
  6. Step 6: Final answer
    x = 205.17

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.