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Finding the Fourth Proportional to 751.80, 1,126.20 and 426.24

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Solution

The fourth proportional to 751.80, 1,126.20 and 426.24 is: 638.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    751.80 : 1,126.20 = 426.24 : x
  2. Step 2: Convert to fraction form
    751.80/1,126.20 = 426.24/x
  3. Step 3: Cross multiply
    751.80x = 1,126.20 × 426.24
  4. Step 4: Simplify right side
    751.80x = 480,031.49
  5. Step 5: Solve for x
    x = 480,031.49/751.80
  6. Step 6: Final answer
    x = 638.51

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1.5x scale

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.