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Finding the Fourth Proportional to 778.77, 1,074.20 and 498.69

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Solution

The fourth proportional to 778.77, 1,074.20 and 498.69 is: 687.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.77 : 1,074.20 = 498.69 : x
  2. Step 2: Convert to fraction form
    778.77/1,074.20 = 498.69/x
  3. Step 3: Cross multiply
    778.77x = 1,074.20 × 498.69
  4. Step 4: Simplify right side
    778.77x = 535,690.30
  5. Step 5: Solve for x
    x = 535,690.30/778.77
  6. Step 6: Final answer
    x = 687.87

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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.