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Finding the Fourth Proportional to 928.18, 1,392.78 and 351.22

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Solution

The fourth proportional to 928.18, 1,392.78 and 351.22 is: 527.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    928.18 : 1,392.78 = 351.22 : x
  2. Step 2: Convert to fraction form
    928.18/1,392.78 = 351.22/x
  3. Step 3: Cross multiply
    928.18x = 1,392.78 × 351.22
  4. Step 4: Simplify right side
    928.18x = 489,172.19
  5. Step 5: Solve for x
    x = 489,172.19/928.18
  6. Step 6: Final answer
    x = 527.02

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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.