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Finding the Fourth Proportional to 928.08, 1,389.78 and 684.78

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Solution

The fourth proportional to 928.08, 1,389.78 and 684.78 is: 1,025.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    928.08 : 1,389.78 = 684.78 : x
  2. Step 2: Convert to fraction form
    928.08/1,389.78 = 684.78/x
  3. Step 3: Cross multiply
    928.08x = 1,389.78 × 684.78
  4. Step 4: Simplify right side
    928.08x = 951,693.55
  5. Step 5: Solve for x
    x = 951,693.55/928.08
  6. Step 6: Final answer
    x = 1,025.44

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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.