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Finding the Fourth Proportional to 985.52, 1,359.86 and 636.12

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Solution

The fourth proportional to 985.52, 1,359.86 and 636.12 is: 877.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.52 : 1,359.86 = 636.12 : x
  2. Step 2: Convert to fraction form
    985.52/1,359.86 = 636.12/x
  3. Step 3: Cross multiply
    985.52x = 1,359.86 × 636.12
  4. Step 4: Simplify right side
    985.52x = 865,034.14
  5. Step 5: Solve for x
    x = 865,034.14/985.52
  6. Step 6: Final answer
    x = 877.74

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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.