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Finding the Fourth Proportional to 1,251.50, 1,726.86 and 720.29

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Solution

The fourth proportional to 1,251.50, 1,726.86 and 720.29 is: 993.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,251.50 : 1,726.86 = 720.29 : x
  2. Step 2: Convert to fraction form
    1,251.50/1,726.86 = 720.29/x
  3. Step 3: Cross multiply
    1,251.50x = 1,726.86 × 720.29
  4. Step 4: Simplify right side
    1,251.50x = 1,243,839.99
  5. Step 5: Solve for x
    x = 1,243,839.99/1,251.50
  6. Step 6: Final answer
    x = 993.88

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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.