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Finding the Fourth Proportional to 1,152.38, 1,727.82 and 421.89

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Solution

The fourth proportional to 1,152.38, 1,727.82 and 421.89 is: 632.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,152.38 : 1,727.82 = 421.89 : x
  2. Step 2: Convert to fraction form
    1,152.38/1,727.82 = 421.89/x
  3. Step 3: Cross multiply
    1,152.38x = 1,727.82 × 421.89
  4. Step 4: Simplify right side
    1,152.38x = 728,949.98
  5. Step 5: Solve for x
    x = 728,949.98/1,152.38
  6. Step 6: Final answer
    x = 632.56

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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.