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Finding the Fourth Proportional to 578.72, 871.18 and 519.19

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Solution

The fourth proportional to 578.72, 871.18 and 519.19 is: 781.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    578.72 : 871.18 = 519.19 : x
  2. Step 2: Convert to fraction form
    578.72/871.18 = 519.19/x
  3. Step 3: Cross multiply
    578.72x = 871.18 × 519.19
  4. Step 4: Simplify right side
    578.72x = 452,307.39
  5. Step 5: Solve for x
    x = 452,307.39/578.72
  6. Step 6: Final answer
    x = 781.56

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.