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Finding the Fourth Proportional to 421.47, 632.59 and 216.18

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Solution

The fourth proportional to 421.47, 632.59 and 216.18 is: 324.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.47 : 632.59 = 216.18 : x
  2. Step 2: Convert to fraction form
    421.47/632.59 = 216.18/x
  3. Step 3: Cross multiply
    421.47x = 632.59 × 216.18
  4. Step 4: Simplify right side
    421.47x = 136,753.31
  5. Step 5: Solve for x
    x = 136,753.31/421.47
  6. Step 6: Final answer
    x = 324.47

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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.