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Finding the Fourth Proportional to 1,391.46, 2,087.18 and 611.28

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Solution

The fourth proportional to 1,391.46, 2,087.18 and 611.28 is: 916.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,391.46 : 2,087.18 = 611.28 : x
  2. Step 2: Convert to fraction form
    1,391.46/2,087.18 = 611.28/x
  3. Step 3: Cross multiply
    1,391.46x = 2,087.18 × 611.28
  4. Step 4: Simplify right side
    1,391.46x = 1,275,851.39
  5. Step 5: Solve for x
    x = 1,275,851.39/1,391.46
  6. Step 6: Final answer
    x = 916.92

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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.