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Finding the Fourth Proportional to 559.20, 836.88 and 431.20

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Solution

The fourth proportional to 559.20, 836.88 and 431.20 is: 645.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    559.20 : 836.88 = 431.20 : x
  2. Step 2: Convert to fraction form
    559.20/836.88 = 431.20/x
  3. Step 3: Cross multiply
    559.20x = 836.88 × 431.20
  4. Step 4: Simplify right side
    559.20x = 360,862.66
  5. Step 5: Solve for x
    x = 360,862.66/559.20
  6. Step 6: Final answer
    x = 645.32

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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.