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Finding the Fourth Proportional to 561, 774.18 and 519.78

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Solution

The fourth proportional to 561, 774.18 and 519.78 is: 717.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    561 : 774.18 = 519.78 : x
  2. Step 2: Convert to fraction form
    561/774.18 = 519.78/x
  3. Step 3: Cross multiply
    561x = 774.18 × 519.78
  4. Step 4: Simplify right side
    561x = 402,403.28
  5. Step 5: Solve for x
    x = 402,403.28/561
  6. Step 6: Final answer
    x = 717.30

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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.