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Finding the Fourth Proportional to 421.81, 632.61 and 147.83

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Solution

The fourth proportional to 421.81, 632.61 and 147.83 is: 221.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.81 : 632.61 = 147.83 : x
  2. Step 2: Convert to fraction form
    421.81/632.61 = 147.83/x
  3. Step 3: Cross multiply
    421.81x = 632.61 × 147.83
  4. Step 4: Simplify right side
    421.81x = 93,515.57
  5. Step 5: Solve for x
    x = 93,515.57/421.81
  6. Step 6: Final answer
    x = 221.70

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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.