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Finding the Fourth Proportional to 1,331.74, 1,838.62 and 912.78

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Solution

The fourth proportional to 1,331.74, 1,838.62 and 912.78 is: 1,260.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,331.74 : 1,838.62 = 912.78 : x
  2. Step 2: Convert to fraction form
    1,331.74/1,838.62 = 912.78/x
  3. Step 3: Cross multiply
    1,331.74x = 1,838.62 × 912.78
  4. Step 4: Simplify right side
    1,331.74x = 1,678,255.56
  5. Step 5: Solve for x
    x = 1,678,255.56/1,331.74
  6. Step 6: Final answer
    x = 1,260.20

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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.