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Finding the Fourth Proportional to 8,653.40, 12,981.96 and 2,809.88

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Solution

The fourth proportional to 8,653.40, 12,981.96 and 2,809.88 is: 4,215.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,653.40 : 12,981.96 = 2,809.88 : x
  2. Step 2: Convert to fraction form
    8,653.40/12,981.96 = 2,809.88/x
  3. Step 3: Cross multiply
    8,653.40x = 12,981.96 × 2,809.88
  4. Step 4: Simplify right side
    8,653.40x = 36,477,749.76
  5. Step 5: Solve for x
    x = 36,477,749.76/8,653.40
  6. Step 6: Final answer
    x = 4,215.42

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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.