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Finding the Fourth Proportional to 439.64, 658.65 and 391.04

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Solution

The fourth proportional to 439.64, 658.65 and 391.04 is: 585.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.64 : 658.65 = 391.04 : x
  2. Step 2: Convert to fraction form
    439.64/658.65 = 391.04/x
  3. Step 3: Cross multiply
    439.64x = 658.65 × 391.04
  4. Step 4: Simplify right side
    439.64x = 257,558.50
  5. Step 5: Solve for x
    x = 257,558.50/439.64
  6. Step 6: Final answer
    x = 585.84

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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.