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Finding the Fourth Proportional to 1,122.96, 1,685.16 and 636.96

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Solution

The fourth proportional to 1,122.96, 1,685.16 and 636.96 is: 955.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,122.96 : 1,685.16 = 636.96 : x
  2. Step 2: Convert to fraction form
    1,122.96/1,685.16 = 636.96/x
  3. Step 3: Cross multiply
    1,122.96x = 1,685.16 × 636.96
  4. Step 4: Simplify right side
    1,122.96x = 1,073,379.51
  5. Step 5: Solve for x
    x = 1,073,379.51/1,122.96
  6. Step 6: Final answer
    x = 955.85

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.