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Finding the Fourth Proportional to 409.71, 614.65 and 135.79

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Solution

The fourth proportional to 409.71, 614.65 and 135.79 is: 203.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    409.71 : 614.65 = 135.79 : x
  2. Step 2: Convert to fraction form
    409.71/614.65 = 135.79/x
  3. Step 3: Cross multiply
    409.71x = 614.65 × 135.79
  4. Step 4: Simplify right side
    409.71x = 83,460.25
  5. Step 5: Solve for x
    x = 83,460.25/409.71
  6. Step 6: Final answer
    x = 203.71

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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.