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Finding the Fourth Proportional to 7,920.89, 10,932.05 and 4,517.90

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Solution

The fourth proportional to 7,920.89, 10,932.05 and 4,517.90 is: 6,235.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,920.89 : 10,932.05 = 4,517.90 : x
  2. Step 2: Convert to fraction form
    7,920.89/10,932.05 = 4,517.90/x
  3. Step 3: Cross multiply
    7,920.89x = 10,932.05 × 4,517.90
  4. Step 4: Simplify right side
    7,920.89x = 49,389,886.11
  5. Step 5: Solve for x
    x = 49,389,886.11/7,920.89
  6. Step 6: Final answer
    x = 6,235.40

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.