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Finding the Fourth Proportional to 8,891.40, 12,270.06 and 4,912.80

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Solution

The fourth proportional to 8,891.40, 12,270.06 and 4,912.80 is: 6,779.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,891.40 : 12,270.06 = 4,912.80 : x
  2. Step 2: Convert to fraction form
    8,891.40/12,270.06 = 4,912.80/x
  3. Step 3: Cross multiply
    8,891.40x = 12,270.06 × 4,912.80
  4. Step 4: Simplify right side
    8,891.40x = 60,280,350.77
  5. Step 5: Solve for x
    x = 60,280,350.77/8,891.40
  6. Step 6: Final answer
    x = 6,779.62

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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.