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Finding the Fourth Proportional to 751.53, 1,128.15 and 748.80

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Solution

The fourth proportional to 751.53, 1,128.15 and 748.80 is: 1,124.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    751.53 : 1,128.15 = 748.80 : x
  2. Step 2: Convert to fraction form
    751.53/1,128.15 = 748.80/x
  3. Step 3: Cross multiply
    751.53x = 1,128.15 × 748.80
  4. Step 4: Simplify right side
    751.53x = 844,758.72
  5. Step 5: Solve for x
    x = 844,758.72/751.53
  6. Step 6: Final answer
    x = 1,124.05

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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.