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Finding the Fourth Proportional to 1,171.24, 1,756.65 and 391.26

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Solution

The fourth proportional to 1,171.24, 1,756.65 and 391.26 is: 586.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,171.24 : 1,756.65 = 391.26 : x
  2. Step 2: Convert to fraction form
    1,171.24/1,756.65 = 391.26/x
  3. Step 3: Cross multiply
    1,171.24x = 1,756.65 × 391.26
  4. Step 4: Simplify right side
    1,171.24x = 687,306.88
  5. Step 5: Solve for x
    x = 687,306.88/1,171.24
  6. Step 6: Final answer
    x = 586.82

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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.