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Finding the Fourth Proportional to 519.19, 715.58 and 387.97

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Solution

The fourth proportional to 519.19, 715.58 and 387.97 is: 534.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    519.19 : 715.58 = 387.97 : x
  2. Step 2: Convert to fraction form
    519.19/715.58 = 387.97/x
  3. Step 3: Cross multiply
    519.19x = 715.58 × 387.97
  4. Step 4: Simplify right side
    519.19x = 277,621.63
  5. Step 5: Solve for x
    x = 277,621.63/519.19
  6. Step 6: Final answer
    x = 534.72

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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.