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Finding the Fourth Proportional to 421.48, 632.36 and 143.82

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Solution

The fourth proportional to 421.48, 632.36 and 143.82 is: 215.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.48 : 632.36 = 143.82 : x
  2. Step 2: Convert to fraction form
    421.48/632.36 = 143.82/x
  3. Step 3: Cross multiply
    421.48x = 632.36 × 143.82
  4. Step 4: Simplify right side
    421.48x = 90,946.02
  5. Step 5: Solve for x
    x = 90,946.02/421.48
  6. Step 6: Final answer
    x = 215.78

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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.