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Finding the Fourth Proportional to 742.40, 1,112.40 and 699.20

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Solution

The fourth proportional to 742.40, 1,112.40 and 699.20 is: 1,047.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    742.40 : 1,112.40 = 699.20 : x
  2. Step 2: Convert to fraction form
    742.40/1,112.40 = 699.20/x
  3. Step 3: Cross multiply
    742.40x = 1,112.40 × 699.20
  4. Step 4: Simplify right side
    742.40x = 777,790.08
  5. Step 5: Solve for x
    x = 777,790.08/742.40
  6. Step 6: Final answer
    x = 1,047.67

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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.