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Finding the Fourth Proportional to 518.88, 715.02 and 387.66

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Solution

The fourth proportional to 518.88, 715.02 and 387.66 is: 534.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.88 : 715.02 = 387.66 : x
  2. Step 2: Convert to fraction form
    518.88/715.02 = 387.66/x
  3. Step 3: Cross multiply
    518.88x = 715.02 × 387.66
  4. Step 4: Simplify right side
    518.88x = 277,184.65
  5. Step 5: Solve for x
    x = 277,184.65/518.88
  6. Step 6: Final answer
    x = 534.20

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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.