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Finding the Fourth Proportional to 756.78, 1,129.90 and 748.94

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Solution

The fourth proportional to 756.78, 1,129.90 and 748.94 is: 1,118.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    756.78 : 1,129.90 = 748.94 : x
  2. Step 2: Convert to fraction form
    756.78/1,129.90 = 748.94/x
  3. Step 3: Cross multiply
    756.78x = 1,129.90 × 748.94
  4. Step 4: Simplify right side
    756.78x = 846,227.31
  5. Step 5: Solve for x
    x = 846,227.31/756.78
  6. Step 6: Final answer
    x = 1,118.19

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.