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Finding the Fourth Proportional to 985.75, 1,360.47 and 636.37

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Solution

The fourth proportional to 985.75, 1,360.47 and 636.37 is: 878.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.75 : 1,360.47 = 636.37 : x
  2. Step 2: Convert to fraction form
    985.75/1,360.47 = 636.37/x
  3. Step 3: Cross multiply
    985.75x = 1,360.47 × 636.37
  4. Step 4: Simplify right side
    985.75x = 865,762.29
  5. Step 5: Solve for x
    x = 865,762.29/985.75
  6. Step 6: Final answer
    x = 878.28

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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.