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Finding the Fourth Proportional to 888.78, 1,226.46 and 557.18

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Solution

The fourth proportional to 888.78, 1,226.46 and 557.18 is: 768.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    888.78 : 1,226.46 = 557.18 : x
  2. Step 2: Convert to fraction form
    888.78/1,226.46 = 557.18/x
  3. Step 3: Cross multiply
    888.78x = 1,226.46 × 557.18
  4. Step 4: Simplify right side
    888.78x = 683,358.98
  5. Step 5: Solve for x
    x = 683,358.98/888.78
  6. Step 6: Final answer
    x = 768.87

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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.