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Finding the Fourth Proportional to 1,171.32, 1,756.98 and 391.17

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Solution

The fourth proportional to 1,171.32, 1,756.98 and 391.17 is: 586.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,171.32 : 1,756.98 = 391.17 : x
  2. Step 2: Convert to fraction form
    1,171.32/1,756.98 = 391.17/x
  3. Step 3: Cross multiply
    1,171.32x = 1,756.98 × 391.17
  4. Step 4: Simplify right side
    1,171.32x = 687,277.87
  5. Step 5: Solve for x
    x = 687,277.87/1,171.32
  6. Step 6: Final answer
    x = 586.76

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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.