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Finding the Fourth Proportional to 1,158.64, 1,739.12 and 726.88

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Solution

The fourth proportional to 1,158.64, 1,739.12 and 726.88 is: 1,091.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,158.64 : 1,739.12 = 726.88 : x
  2. Step 2: Convert to fraction form
    1,158.64/1,739.12 = 726.88/x
  3. Step 3: Cross multiply
    1,158.64x = 1,739.12 × 726.88
  4. Step 4: Simplify right side
    1,158.64x = 1,264,131.55
  5. Step 5: Solve for x
    x = 1,264,131.55/1,158.64
  6. Step 6: Final answer
    x = 1,091.05

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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.