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Finding the Fourth Proportional to 1,358.31, 1,874.19 and 768.81

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Solution

The fourth proportional to 1,358.31, 1,874.19 and 768.81 is: 1,060.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,358.31 : 1,874.19 = 768.81 : x
  2. Step 2: Convert to fraction form
    1,358.31/1,874.19 = 768.81/x
  3. Step 3: Cross multiply
    1,358.31x = 1,874.19 × 768.81
  4. Step 4: Simplify right side
    1,358.31x = 1,440,896.01
  5. Step 5: Solve for x
    x = 1,440,896.01/1,358.31
  6. Step 6: Final answer
    x = 1,060.80

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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.