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Finding the Fourth Proportional to 421.12, 631.66 and 147.18

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Solution

The fourth proportional to 421.12, 631.66 and 147.18 is: 220.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.12 : 631.66 = 147.18 : x
  2. Step 2: Convert to fraction form
    421.12/631.66 = 147.18/x
  3. Step 3: Cross multiply
    421.12x = 631.66 × 147.18
  4. Step 4: Simplify right side
    421.12x = 92,967.72
  5. Step 5: Solve for x
    x = 92,967.72/421.12
  6. Step 6: Final answer
    x = 220.76

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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.