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Finding the Fourth Proportional to 520.73, 718.36 and 310.79

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Solution

The fourth proportional to 520.73, 718.36 and 310.79 is: 428.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    520.73 : 718.36 = 310.79 : x
  2. Step 2: Convert to fraction form
    520.73/718.36 = 310.79/x
  3. Step 3: Cross multiply
    520.73x = 718.36 × 310.79
  4. Step 4: Simplify right side
    520.73x = 223,255.90
  5. Step 5: Solve for x
    x = 223,255.90/520.73
  6. Step 6: Final answer
    x = 428.74

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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.