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Finding the Fourth Proportional to 679.92, 1,019.52 and 355.20

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Solution

The fourth proportional to 679.92, 1,019.52 and 355.20 is: 532.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.92 : 1,019.52 = 355.20 : x
  2. Step 2: Convert to fraction form
    679.92/1,019.52 = 355.20/x
  3. Step 3: Cross multiply
    679.92x = 1,019.52 × 355.20
  4. Step 4: Simplify right side
    679.92x = 362,133.50
  5. Step 5: Solve for x
    x = 362,133.50/679.92
  6. Step 6: Final answer
    x = 532.61

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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.