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Finding the Fourth Proportional to 1,391.50, 2,086.44 and 611.47

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Solution

The fourth proportional to 1,391.50, 2,086.44 and 611.47 is: 916.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,391.50 : 2,086.44 = 611.47 : x
  2. Step 2: Convert to fraction form
    1,391.50/2,086.44 = 611.47/x
  3. Step 3: Cross multiply
    1,391.50x = 2,086.44 × 611.47
  4. Step 4: Simplify right side
    1,391.50x = 1,275,795.47
  5. Step 5: Solve for x
    x = 1,275,795.47/1,391.50
  6. Step 6: Final answer
    x = 916.85

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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.