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Finding the Fourth Proportional to 520.66, 718.45 and 287.74

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Solution

The fourth proportional to 520.66, 718.45 and 287.74 is: 397.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    520.66 : 718.45 = 287.74 : x
  2. Step 2: Convert to fraction form
    520.66/718.45 = 287.74/x
  3. Step 3: Cross multiply
    520.66x = 718.45 × 287.74
  4. Step 4: Simplify right side
    520.66x = 206,722.49
  5. Step 5: Solve for x
    x = 206,722.49/520.66
  6. Step 6: Final answer
    x = 397.04

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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.