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Finding the Fourth Proportional to 8,811.64, 12,159.20 and 5,274.78

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Solution

The fourth proportional to 8,811.64, 12,159.20 and 5,274.78 is: 7,278.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,811.64 : 12,159.20 = 5,274.78 : x
  2. Step 2: Convert to fraction form
    8,811.64/12,159.20 = 5,274.78/x
  3. Step 3: Cross multiply
    8,811.64x = 12,159.20 × 5,274.78
  4. Step 4: Simplify right side
    8,811.64x = 64,137,104.98
  5. Step 5: Solve for x
    x = 64,137,104.98/8,811.64
  6. Step 6: Final answer
    x = 7,278.68

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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.