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Finding the Fourth Proportional to 1,120.54, 1,680.24 and 658.46

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Solution

The fourth proportional to 1,120.54, 1,680.24 and 658.46 is: 987.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,120.54 : 1,680.24 = 658.46 : x
  2. Step 2: Convert to fraction form
    1,120.54/1,680.24 = 658.46/x
  3. Step 3: Cross multiply
    1,120.54x = 1,680.24 × 658.46
  4. Step 4: Simplify right side
    1,120.54x = 1,106,377.50
  5. Step 5: Solve for x
    x = 1,106,377.50/1,120.54
  6. Step 6: Final answer
    x = 987.36

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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.