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Finding the Fourth Proportional to 8,891.89, 12,270.63 and 4,912.90

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Solution

The fourth proportional to 8,891.89, 12,270.63 and 4,912.90 is: 6,779.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,891.89 : 12,270.63 = 4,912.90 : x
  2. Step 2: Convert to fraction form
    8,891.89/12,270.63 = 4,912.90/x
  3. Step 3: Cross multiply
    8,891.89x = 12,270.63 × 4,912.90
  4. Step 4: Simplify right side
    8,891.89x = 60,284,378.13
  5. Step 5: Solve for x
    x = 60,284,378.13/8,891.89
  6. Step 6: Final answer
    x = 6,779.70

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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.