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Finding the Fourth Proportional to 1,201.71, 1,658.43 and 677.82

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Solution

The fourth proportional to 1,201.71, 1,658.43 and 677.82 is: 935.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,201.71 : 1,658.43 = 677.82 : x
  2. Step 2: Convert to fraction form
    1,201.71/1,658.43 = 677.82/x
  3. Step 3: Cross multiply
    1,201.71x = 1,658.43 × 677.82
  4. Step 4: Simplify right side
    1,201.71x = 1,124,117.02
  5. Step 5: Solve for x
    x = 1,124,117.02/1,201.71
  6. Step 6: Final answer
    x = 935.43

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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.