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Finding the Fourth Proportional to 1,390.97, 2,087.67 and 742.16

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Solution

The fourth proportional to 1,390.97, 2,087.67 and 742.16 is: 1,113.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,390.97 : 2,087.67 = 742.16 : x
  2. Step 2: Convert to fraction form
    1,390.97/2,087.67 = 742.16/x
  3. Step 3: Cross multiply
    1,390.97x = 2,087.67 × 742.16
  4. Step 4: Simplify right side
    1,390.97x = 1,549,393.17
  5. Step 5: Solve for x
    x = 1,549,393.17/1,390.97
  6. Step 6: Final answer
    x = 1,113.89

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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.