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Finding the Fourth Proportional to 749.72, 1,122.73 and 687.29

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Solution

The fourth proportional to 749.72, 1,122.73 and 687.29 is: 1,029.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    749.72 : 1,122.73 = 687.29 : x
  2. Step 2: Convert to fraction form
    749.72/1,122.73 = 687.29/x
  3. Step 3: Cross multiply
    749.72x = 1,122.73 × 687.29
  4. Step 4: Simplify right side
    749.72x = 771,633.77
  5. Step 5: Solve for x
    x = 771,633.77/749.72
  6. Step 6: Final answer
    x = 1,029.23

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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.