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Finding the Fourth Proportional to 715.44, 1,074.12 and 423.48

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Solution

The fourth proportional to 715.44, 1,074.12 and 423.48 is: 635.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    715.44 : 1,074.12 = 423.48 : x
  2. Step 2: Convert to fraction form
    715.44/1,074.12 = 423.48/x
  3. Step 3: Cross multiply
    715.44x = 1,074.12 × 423.48
  4. Step 4: Simplify right side
    715.44x = 454,868.34
  5. Step 5: Solve for x
    x = 454,868.34/715.44
  6. Step 6: Final answer
    x = 635.79

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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.