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Finding the Fourth Proportional to 517.75, 714.50 and 310.75

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Solution

The fourth proportional to 517.75, 714.50 and 310.75 is: 428.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    517.75 : 714.50 = 310.75 : x
  2. Step 2: Convert to fraction form
    517.75/714.50 = 310.75/x
  3. Step 3: Cross multiply
    517.75x = 714.50 × 310.75
  4. Step 4: Simplify right side
    517.75x = 222,029.32
  5. Step 5: Solve for x
    x = 222,029.32/517.75
  6. Step 6: Final answer
    x = 428.84

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1.5x scale

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.