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Finding the Fourth Proportional to 421.56, 632.16 and 147.57

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Solution

The fourth proportional to 421.56, 632.16 and 147.57 is: 221.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.56 : 632.16 = 147.57 : x
  2. Step 2: Convert to fraction form
    421.56/632.16 = 147.57/x
  3. Step 3: Cross multiply
    421.56x = 632.16 × 147.57
  4. Step 4: Simplify right side
    421.56x = 93,287.85
  5. Step 5: Solve for x
    x = 93,287.85/421.56
  6. Step 6: Final answer
    x = 221.29

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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.