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Finding the Fourth Proportional to 520.48, 718.23 and 287.61

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Solution

The fourth proportional to 520.48, 718.23 and 287.61 is: 396.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    520.48 : 718.23 = 287.61 : x
  2. Step 2: Convert to fraction form
    520.48/718.23 = 287.61/x
  3. Step 3: Cross multiply
    520.48x = 718.23 × 287.61
  4. Step 4: Simplify right side
    520.48x = 206,570.13
  5. Step 5: Solve for x
    x = 206,570.13/520.48
  6. Step 6: Final answer
    x = 396.88

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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.