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Finding the Fourth Proportional to 748.18, 1,120.74 and 439.10

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Solution

The fourth proportional to 748.18, 1,120.74 and 439.10 is: 657.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    748.18 : 1,120.74 = 439.10 : x
  2. Step 2: Convert to fraction form
    748.18/1,120.74 = 439.10/x
  3. Step 3: Cross multiply
    748.18x = 1,120.74 × 439.10
  4. Step 4: Simplify right side
    748.18x = 492,113.89
  5. Step 5: Solve for x
    x = 492,113.89/748.18
  6. Step 6: Final answer
    x = 657.75

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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.