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Finding the Fourth Proportional to 751.12, 1,126.68 and 426.32

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Solution

The fourth proportional to 751.12, 1,126.68 and 426.32 is: 639.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    751.12 : 1,126.68 = 426.32 : x
  2. Step 2: Convert to fraction form
    751.12/1,126.68 = 426.32/x
  3. Step 3: Cross multiply
    751.12x = 1,126.68 × 426.32
  4. Step 4: Simplify right side
    751.12x = 480,326.22
  5. Step 5: Solve for x
    x = 480,326.22/751.12
  6. Step 6: Final answer
    x = 639.48

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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.