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Finding the Fourth Proportional to 519.79, 778.47 and 410.85

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Solution

The fourth proportional to 519.79, 778.47 and 410.85 is: 615.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    519.79 : 778.47 = 410.85 : x
  2. Step 2: Convert to fraction form
    519.79/778.47 = 410.85/x
  3. Step 3: Cross multiply
    519.79x = 778.47 × 410.85
  4. Step 4: Simplify right side
    519.79x = 319,834.40
  5. Step 5: Solve for x
    x = 319,834.40/519.79
  6. Step 6: Final answer
    x = 615.31

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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.