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Finding the Fourth Proportional to 408.64, 613.14 and 148.72

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Solution

The fourth proportional to 408.64, 613.14 and 148.72 is: 223.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    408.64 : 613.14 = 148.72 : x
  2. Step 2: Convert to fraction form
    408.64/613.14 = 148.72/x
  3. Step 3: Cross multiply
    408.64x = 613.14 × 148.72
  4. Step 4: Simplify right side
    408.64x = 91,186.18
  5. Step 5: Solve for x
    x = 91,186.18/408.64
  6. Step 6: Final answer
    x = 223.15

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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.