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Finding the Fourth Proportional to 888.78, 1,330.38 and 613.26

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Solution

The fourth proportional to 888.78, 1,330.38 and 613.26 is: 917.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    888.78 : 1,330.38 = 613.26 : x
  2. Step 2: Convert to fraction form
    888.78/1,330.38 = 613.26/x
  3. Step 3: Cross multiply
    888.78x = 1,330.38 × 613.26
  4. Step 4: Simplify right side
    888.78x = 815,868.84
  5. Step 5: Solve for x
    x = 815,868.84/888.78
  6. Step 6: Final answer
    x = 917.96

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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.