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Finding the Fourth Proportional to 865.91, 1,297.85 and 519.50

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Solution

The fourth proportional to 865.91, 1,297.85 and 519.50 is: 778.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    865.91 : 1,297.85 = 519.50 : x
  2. Step 2: Convert to fraction form
    865.91/1,297.85 = 519.50/x
  3. Step 3: Cross multiply
    865.91x = 1,297.85 × 519.50
  4. Step 4: Simplify right side
    865.91x = 674,223.99
  5. Step 5: Solve for x
    x = 674,223.99/865.91
  6. Step 6: Final answer
    x = 778.64

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.