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Finding the Fourth Proportional to 407.56, 611.32 and 147.55

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Solution

The fourth proportional to 407.56, 611.32 and 147.55 is: 221.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    407.56 : 611.32 = 147.55 : x
  2. Step 2: Convert to fraction form
    407.56/611.32 = 147.55/x
  3. Step 3: Cross multiply
    407.56x = 611.32 × 147.55
  4. Step 4: Simplify right side
    407.56x = 90,200.27
  5. Step 5: Solve for x
    x = 90,200.27/407.56
  6. Step 6: Final answer
    x = 221.32

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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.