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Finding the Fourth Proportional to 744.24, 1,115.28 and 419.52

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Solution

The fourth proportional to 744.24, 1,115.28 and 419.52 is: 628.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    744.24 : 1,115.28 = 419.52 : x
  2. Step 2: Convert to fraction form
    744.24/1,115.28 = 419.52/x
  3. Step 3: Cross multiply
    744.24x = 1,115.28 × 419.52
  4. Step 4: Simplify right side
    744.24x = 467,882.27
  5. Step 5: Solve for x
    x = 467,882.27/744.24
  6. Step 6: Final answer
    x = 628.67

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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.