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Finding the Fourth Proportional to 751.12, 1,120.06 and 699.19

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Solution

The fourth proportional to 751.12, 1,120.06 and 699.19 is: 1,042.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    751.12 : 1,120.06 = 699.19 : x
  2. Step 2: Convert to fraction form
    751.12/1,120.06 = 699.19/x
  3. Step 3: Cross multiply
    751.12x = 1,120.06 × 699.19
  4. Step 4: Simplify right side
    751.12x = 783,134.75
  5. Step 5: Solve for x
    x = 783,134.75/751.12
  6. Step 6: Final answer
    x = 1,042.62

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.