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Finding the Fourth Proportional to 520.14, 717.72 and 310.31

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Solution

The fourth proportional to 520.14, 717.72 and 310.31 is: 428.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    520.14 : 717.72 = 310.31 : x
  2. Step 2: Convert to fraction form
    520.14/717.72 = 310.31/x
  3. Step 3: Cross multiply
    520.14x = 717.72 × 310.31
  4. Step 4: Simplify right side
    520.14x = 222,712.10
  5. Step 5: Solve for x
    x = 222,712.10/520.14
  6. Step 6: Final answer
    x = 428.18

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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.