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Finding the Fourth Proportional to 677.88, 1,015.20 and 515.88

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Solution

The fourth proportional to 677.88, 1,015.20 and 515.88 is: 772.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    677.88 : 1,015.20 = 515.88 : x
  2. Step 2: Convert to fraction form
    677.88/1,015.20 = 515.88/x
  3. Step 3: Cross multiply
    677.88x = 1,015.20 × 515.88
  4. Step 4: Simplify right side
    677.88x = 523,721.38
  5. Step 5: Solve for x
    x = 523,721.38/677.88
  6. Step 6: Final answer
    x = 772.59

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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.