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Finding the Fourth Proportional to 1,251.66, 1,726.32 and 920.79

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Solution

The fourth proportional to 1,251.66, 1,726.32 and 920.79 is: 1,269.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,251.66 : 1,726.32 = 920.79 : x
  2. Step 2: Convert to fraction form
    1,251.66/1,726.32 = 920.79/x
  3. Step 3: Cross multiply
    1,251.66x = 1,726.32 × 920.79
  4. Step 4: Simplify right side
    1,251.66x = 1,589,578.19
  5. Step 5: Solve for x
    x = 1,589,578.19/1,251.66
  6. Step 6: Final answer
    x = 1,269.98

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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.