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Finding the Fourth Proportional to 1,120.78, 1,680.45 and 888.85

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Solution

The fourth proportional to 1,120.78, 1,680.45 and 888.85 is: 1,332.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,120.78 : 1,680.45 = 888.85 : x
  2. Step 2: Convert to fraction form
    1,120.78/1,680.45 = 888.85/x
  3. Step 3: Cross multiply
    1,120.78x = 1,680.45 × 888.85
  4. Step 4: Simplify right side
    1,120.78x = 1,493,667.98
  5. Step 5: Solve for x
    x = 1,493,667.98/1,120.78
  6. Step 6: Final answer
    x = 1,332.70

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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.