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Finding the Fourth Proportional to 409.54, 614.40 and 135.58

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Solution

The fourth proportional to 409.54, 614.40 and 135.58 is: 203.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    409.54 : 614.40 = 135.58 : x
  2. Step 2: Convert to fraction form
    409.54/614.40 = 135.58/x
  3. Step 3: Cross multiply
    409.54x = 614.40 × 135.58
  4. Step 4: Simplify right side
    409.54x = 83,300.35
  5. Step 5: Solve for x
    x = 83,300.35/409.54
  6. Step 6: Final answer
    x = 203.40

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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.