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Finding the Fourth Proportional to 677.80, 1,015.98 and 515.08

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Solution

The fourth proportional to 677.80, 1,015.98 and 515.08 is: 772.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    677.80 : 1,015.98 = 515.08 : x
  2. Step 2: Convert to fraction form
    677.80/1,015.98 = 515.08/x
  3. Step 3: Cross multiply
    677.80x = 1,015.98 × 515.08
  4. Step 4: Simplify right side
    677.80x = 523,310.98
  5. Step 5: Solve for x
    x = 523,310.98/677.80
  6. Step 6: Final answer
    x = 772.07

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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.