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Finding the Fourth Proportional to 559.95, 772.70 and 311.25

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Solution

The fourth proportional to 559.95, 772.70 and 311.25 is: 429.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    559.95 : 772.70 = 311.25 : x
  2. Step 2: Convert to fraction form
    559.95/772.70 = 311.25/x
  3. Step 3: Cross multiply
    559.95x = 772.70 × 311.25
  4. Step 4: Simplify right side
    559.95x = 240,503.25
  5. Step 5: Solve for x
    x = 240,503.25/559.95
  6. Step 6: Final answer
    x = 429.51

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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.