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Finding the Fourth Proportional to 751.80, 1,128.24 and 319.26

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Solution

The fourth proportional to 751.80, 1,128.24 and 319.26 is: 479.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    751.80 : 1,128.24 = 319.26 : x
  2. Step 2: Convert to fraction form
    751.80/1,128.24 = 319.26/x
  3. Step 3: Cross multiply
    751.80x = 1,128.24 × 319.26
  4. Step 4: Simplify right side
    751.80x = 360,201.90
  5. Step 5: Solve for x
    x = 360,201.90/751.80
  6. Step 6: Final answer
    x = 479.12

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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.