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Finding the Fourth Proportional to 1,123.38, 1,685.28 and 919.80

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Solution

The fourth proportional to 1,123.38, 1,685.28 and 919.80 is: 1,379.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,123.38 : 1,685.28 = 919.80 : x
  2. Step 2: Convert to fraction form
    1,123.38/1,685.28 = 919.80/x
  3. Step 3: Cross multiply
    1,123.38x = 1,685.28 × 919.80
  4. Step 4: Simplify right side
    1,123.38x = 1,550,120.54
  5. Step 5: Solve for x
    x = 1,550,120.54/1,123.38
  6. Step 6: Final answer
    x = 1,379.87

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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.