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Finding the Fourth Proportional to 409.86, 614.88 and 135.95

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Solution

The fourth proportional to 409.86, 614.88 and 135.95 is: 203.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    409.86 : 614.88 = 135.95 : x
  2. Step 2: Convert to fraction form
    409.86/614.88 = 135.95/x
  3. Step 3: Cross multiply
    409.86x = 614.88 × 135.95
  4. Step 4: Simplify right side
    409.86x = 83,589.86
  5. Step 5: Solve for x
    x = 83,589.86/409.86
  6. Step 6: Final answer
    x = 203.95

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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.