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Finding the Fourth Proportional to 252.18, 378.36 and 149.40

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Solution

The fourth proportional to 252.18, 378.36 and 149.40 is: 224.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    252.18 : 378.36 = 149.40 : x
  2. Step 2: Convert to fraction form
    252.18/378.36 = 149.40/x
  3. Step 3: Cross multiply
    252.18x = 378.36 × 149.40
  4. Step 4: Simplify right side
    252.18x = 56,526.98
  5. Step 5: Solve for x
    x = 56,526.98/252.18
  6. Step 6: Final answer
    x = 224.15

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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.