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Finding the Fourth Proportional to 985.23, 1,359.63 and 636.53

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Solution

The fourth proportional to 985.23, 1,359.63 and 636.53 is: 878.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.23 : 1,359.63 = 636.53 : x
  2. Step 2: Convert to fraction form
    985.23/1,359.63 = 636.53/x
  3. Step 3: Cross multiply
    985.23x = 1,359.63 × 636.53
  4. Step 4: Simplify right side
    985.23x = 865,438.49
  5. Step 5: Solve for x
    x = 865,438.49/985.23
  6. Step 6: Final answer
    x = 878.41

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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.