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Finding the Fourth Proportional to 7,913.20, 11,870.20 and 2,069.84

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Solution

The fourth proportional to 7,913.20, 11,870.20 and 2,069.84 is: 3,104.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,913.20 : 11,870.20 = 2,069.84 : x
  2. Step 2: Convert to fraction form
    7,913.20/11,870.20 = 2,069.84/x
  3. Step 3: Cross multiply
    7,913.20x = 11,870.20 × 2,069.84
  4. Step 4: Simplify right side
    7,913.20x = 24,569,414.77
  5. Step 5: Solve for x
    x = 24,569,414.77/7,913.20
  6. Step 6: Final answer
    x = 3,104.86

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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.