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Finding the Fourth Proportional to 391.40, 586.95 and 131.35

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Solution

The fourth proportional to 391.40, 586.95 and 131.35 is: 196.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.40 : 586.95 = 131.35 : x
  2. Step 2: Convert to fraction form
    391.40/586.95 = 131.35/x
  3. Step 3: Cross multiply
    391.40x = 586.95 × 131.35
  4. Step 4: Simplify right side
    391.40x = 77,094.42
  5. Step 5: Solve for x
    x = 77,094.42/391.40
  6. Step 6: Final answer
    x = 196.97

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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.