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Finding the Fourth Proportional to 985.62, 1,360.11 and 636.31

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Solution

The fourth proportional to 985.62, 1,360.11 and 636.31 is: 878.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.62 : 1,360.11 = 636.31 : x
  2. Step 2: Convert to fraction form
    985.62/1,360.11 = 636.31/x
  3. Step 3: Cross multiply
    985.62x = 1,360.11 × 636.31
  4. Step 4: Simplify right side
    985.62x = 865,451.59
  5. Step 5: Solve for x
    x = 865,451.59/985.62
  6. Step 6: Final answer
    x = 878.08

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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.