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Finding the Fourth Proportional to 391.63, 586.66 and 186.40

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Solution

The fourth proportional to 391.63, 586.66 and 186.40 is: 279.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.63 : 586.66 = 186.40 : x
  2. Step 2: Convert to fraction form
    391.63/586.66 = 186.40/x
  3. Step 3: Cross multiply
    391.63x = 586.66 × 186.40
  4. Step 4: Simplify right side
    391.63x = 109,349.56
  5. Step 5: Solve for x
    x = 109,349.56/391.63
  6. Step 6: Final answer
    x = 279.22

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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.