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Finding the Fourth Proportional to 751.76, 1,125.30 and 687.96

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Solution

The fourth proportional to 751.76, 1,125.30 and 687.96 is: 1,029.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    751.76 : 1,125.30 = 687.96 : x
  2. Step 2: Convert to fraction form
    751.76/1,125.30 = 687.96/x
  3. Step 3: Cross multiply
    751.76x = 1,125.30 × 687.96
  4. Step 4: Simplify right side
    751.76x = 774,161.39
  5. Step 5: Solve for x
    x = 774,161.39/751.76
  6. Step 6: Final answer
    x = 1,029.80

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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.