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Finding the Fourth Proportional to 1,089.78, 1,502.64 and 868.56

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Solution

The fourth proportional to 1,089.78, 1,502.64 and 868.56 is: 1,197.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,089.78 : 1,502.64 = 868.56 : x
  2. Step 2: Convert to fraction form
    1,089.78/1,502.64 = 868.56/x
  3. Step 3: Cross multiply
    1,089.78x = 1,502.64 × 868.56
  4. Step 4: Simplify right side
    1,089.78x = 1,305,133.00
  5. Step 5: Solve for x
    x = 1,305,133.00/1,089.78
  6. Step 6: Final answer
    x = 1,197.61

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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.