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Finding the Fourth Proportional to 754.86, 1,134.21 and 708.78

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Solution

The fourth proportional to 754.86, 1,134.21 and 708.78 is: 1,064.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    754.86 : 1,134.21 = 708.78 : x
  2. Step 2: Convert to fraction form
    754.86/1,134.21 = 708.78/x
  3. Step 3: Cross multiply
    754.86x = 1,134.21 × 708.78
  4. Step 4: Simplify right side
    754.86x = 803,905.36
  5. Step 5: Solve for x
    x = 803,905.36/754.86
  6. Step 6: Final answer
    x = 1,064.97

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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.