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Finding the Fourth Proportional to 983.75, 1,357.71 and 634.37

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Solution

The fourth proportional to 983.75, 1,357.71 and 634.37 is: 875.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    983.75 : 1,357.71 = 634.37 : x
  2. Step 2: Convert to fraction form
    983.75/1,357.71 = 634.37/x
  3. Step 3: Cross multiply
    983.75x = 1,357.71 × 634.37
  4. Step 4: Simplify right side
    983.75x = 861,290.49
  5. Step 5: Solve for x
    x = 861,290.49/983.75
  6. Step 6: Final answer
    x = 875.52

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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.