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Finding the Fourth Proportional to 1,309.88, 1,962.96 and 725.14

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Solution

The fourth proportional to 1,309.88, 1,962.96 and 725.14 is: 1,086.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,309.88 : 1,962.96 = 725.14 : x
  2. Step 2: Convert to fraction form
    1,309.88/1,962.96 = 725.14/x
  3. Step 3: Cross multiply
    1,309.88x = 1,962.96 × 725.14
  4. Step 4: Simplify right side
    1,309.88x = 1,423,415.91
  5. Step 5: Solve for x
    x = 1,423,415.91/1,309.88
  6. Step 6: Final answer
    x = 1,086.68

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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.