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Finding the Fourth Proportional to 1,391.72, 2,086.44 and 611.15

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Solution

The fourth proportional to 1,391.72, 2,086.44 and 611.15 is: 916.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,391.72 : 2,086.44 = 611.15 : x
  2. Step 2: Convert to fraction form
    1,391.72/2,086.44 = 611.15/x
  3. Step 3: Cross multiply
    1,391.72x = 2,086.44 × 611.15
  4. Step 4: Simplify right side
    1,391.72x = 1,275,127.81
  5. Step 5: Solve for x
    x = 1,275,127.81/1,391.72
  6. Step 6: Final answer
    x = 916.22

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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.