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Finding the Fourth Proportional to 1,147.47, 1,721.21 and 281.79

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Solution

The fourth proportional to 1,147.47, 1,721.21 and 281.79 is: 422.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,147.47 : 1,721.21 = 281.79 : x
  2. Step 2: Convert to fraction form
    1,147.47/1,721.21 = 281.79/x
  3. Step 3: Cross multiply
    1,147.47x = 1,721.21 × 281.79
  4. Step 4: Simplify right side
    1,147.47x = 485,019.77
  5. Step 5: Solve for x
    x = 485,019.77/1,147.47
  6. Step 6: Final answer
    x = 422.69

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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.