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Finding the Fourth Proportional to 1,201.75, 1,658.12 and 677.78

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Solution

The fourth proportional to 1,201.75, 1,658.12 and 677.78 is: 935.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,201.75 : 1,658.12 = 677.78 : x
  2. Step 2: Convert to fraction form
    1,201.75/1,658.12 = 677.78/x
  3. Step 3: Cross multiply
    1,201.75x = 1,658.12 × 677.78
  4. Step 4: Simplify right side
    1,201.75x = 1,123,840.57
  5. Step 5: Solve for x
    x = 1,123,840.57/1,201.75
  6. Step 6: Final answer
    x = 935.17

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1.5x scale

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.