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Finding the Fourth Proportional to 679.52, 1,020 and 423.56

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Solution

The fourth proportional to 679.52, 1,020 and 423.56 is: 635.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.52 : 1,020 = 423.56 : x
  2. Step 2: Convert to fraction form
    679.52/1,020 = 423.56/x
  3. Step 3: Cross multiply
    679.52x = 1,020 × 423.56
  4. Step 4: Simplify right side
    679.52x = 432,031.20
  5. Step 5: Solve for x
    x = 432,031.20/679.52
  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.