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Finding the Fourth Proportional to 391.02, 586.47 and 131.02

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Solution

The fourth proportional to 391.02, 586.47 and 131.02 is: 196.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.02 : 586.47 = 131.02 : x
  2. Step 2: Convert to fraction form
    391.02/586.47 = 131.02/x
  3. Step 3: Cross multiply
    391.02x = 586.47 × 131.02
  4. Step 4: Simplify right side
    391.02x = 76,839.24
  5. Step 5: Solve for x
    x = 76,839.24/391.02
  6. Step 6: Final answer
    x = 196.51

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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.