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Finding the Fourth Proportional to 778.36, 1,073.76 and 479.70

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Solution

The fourth proportional to 778.36, 1,073.76 and 479.70 is: 661.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.36 : 1,073.76 = 479.70 : x
  2. Step 2: Convert to fraction form
    778.36/1,073.76 = 479.70/x
  3. Step 3: Cross multiply
    778.36x = 1,073.76 × 479.70
  4. Step 4: Simplify right side
    778.36x = 515,077.85
  5. Step 5: Solve for x
    x = 515,077.85/778.36
  6. Step 6: Final answer
    x = 661.75

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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.