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Finding the Fourth Proportional to 559.80, 772.46 and 311.04

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Solution

The fourth proportional to 559.80, 772.46 and 311.04 is: 429.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    559.80 : 772.46 = 311.04 : x
  2. Step 2: Convert to fraction form
    559.80/772.46 = 311.04/x
  3. Step 3: Cross multiply
    559.80x = 772.46 × 311.04
  4. Step 4: Simplify right side
    559.80x = 240,264.40
  5. Step 5: Solve for x
    x = 240,264.40/559.80
  6. Step 6: Final answer
    x = 429.20

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.