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Finding the Fourth Proportional to 888.78, 1,226.49 and 515.78

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Solution

The fourth proportional to 888.78, 1,226.49 and 515.78 is: 711.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    888.78 : 1,226.49 = 515.78 : x
  2. Step 2: Convert to fraction form
    888.78/1,226.49 = 515.78/x
  3. Step 3: Cross multiply
    888.78x = 1,226.49 × 515.78
  4. Step 4: Simplify right side
    888.78x = 632,592.88
  5. Step 5: Solve for x
    x = 632,592.88/888.78
  6. Step 6: Final answer
    x = 711.75

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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.