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Finding the Fourth Proportional to 984.05, 1,357.97 and 634.74

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Solution

The fourth proportional to 984.05, 1,357.97 and 634.74 is: 875.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    984.05 : 1,357.97 = 634.74 : x
  2. Step 2: Convert to fraction form
    984.05/1,357.97 = 634.74/x
  3. Step 3: Cross multiply
    984.05x = 1,357.97 × 634.74
  4. Step 4: Simplify right side
    984.05x = 861,949.61
  5. Step 5: Solve for x
    x = 861,949.61/984.05
  6. Step 6: Final answer
    x = 875.92

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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.