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Finding the Fourth Proportional to 1,391.97, 2,087.14 and 742.35

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Solution

The fourth proportional to 1,391.97, 2,087.14 and 742.35 is: 1,113.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,391.97 : 2,087.14 = 742.35 : x
  2. Step 2: Convert to fraction form
    1,391.97/2,087.14 = 742.35/x
  3. Step 3: Cross multiply
    1,391.97x = 2,087.14 × 742.35
  4. Step 4: Simplify right side
    1,391.97x = 1,549,388.38
  5. Step 5: Solve for x
    x = 1,549,388.38/1,391.97
  6. Step 6: Final answer
    x = 1,113.09

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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.