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Finding the Fourth Proportional to 746.40, 1,029.42 and 696.72

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Solution

The fourth proportional to 746.40, 1,029.42 and 696.72 is: 960.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    746.40 : 1,029.42 = 696.72 : x
  2. Step 2: Convert to fraction form
    746.40/1,029.42 = 696.72/x
  3. Step 3: Cross multiply
    746.40x = 1,029.42 × 696.72
  4. Step 4: Simplify right side
    746.40x = 717,217.50
  5. Step 5: Solve for x
    x = 717,217.50/746.40
  6. Step 6: Final answer
    x = 960.90

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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.