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Finding the Fourth Proportional to 1,251.72, 1,726.62 and 921

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Solution

The fourth proportional to 1,251.72, 1,726.62 and 921 is: 1,270.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,251.72 : 1,726.62 = 921 : x
  2. Step 2: Convert to fraction form
    1,251.72/1,726.62 = 921/x
  3. Step 3: Cross multiply
    1,251.72x = 1,726.62 × 921
  4. Step 4: Simplify right side
    1,251.72x = 1,590,217.02
  5. Step 5: Solve for x
    x = 1,590,217.02/1,251.72
  6. Step 6: Final answer
    x = 1,270.43

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.