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Finding the Fourth Proportional to 779.15, 1,074.87 and 613.10

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Solution

The fourth proportional to 779.15, 1,074.87 and 613.10 is: 845.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    779.15 : 1,074.87 = 613.10 : x
  2. Step 2: Convert to fraction form
    779.15/1,074.87 = 613.10/x
  3. Step 3: Cross multiply
    779.15x = 1,074.87 × 613.10
  4. Step 4: Simplify right side
    779.15x = 659,005.48
  5. Step 5: Solve for x
    x = 659,005.48/779.15
  6. Step 6: Final answer
    x = 845.80

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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.