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Finding the Fourth Proportional to 750.72, 1,126.12 and 426.72

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Solution

The fourth proportional to 750.72, 1,126.12 and 426.72 is: 640.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    750.72 : 1,126.12 = 426.72 : x
  2. Step 2: Convert to fraction form
    750.72/1,126.12 = 426.72/x
  3. Step 3: Cross multiply
    750.72x = 1,126.12 × 426.72
  4. Step 4: Simplify right side
    750.72x = 480,537.93
  5. Step 5: Solve for x
    x = 480,537.93/750.72
  6. Step 6: Final answer
    x = 640.10

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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.