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Finding the Fourth Proportional to 1,171.28, 1,755.59 and 391.10

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Solution

The fourth proportional to 1,171.28, 1,755.59 and 391.10 is: 586.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,171.28 : 1,755.59 = 391.10 : x
  2. Step 2: Convert to fraction form
    1,171.28/1,755.59 = 391.10/x
  3. Step 3: Cross multiply
    1,171.28x = 1,755.59 × 391.10
  4. Step 4: Simplify right side
    1,171.28x = 686,612.59
  5. Step 5: Solve for x
    x = 686,612.59/1,171.28
  6. Step 6: Final answer
    x = 586.21

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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.