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Finding the Fourth Proportional to 8,655.71, 12,985.20 and 2,811.56

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Solution

The fourth proportional to 8,655.71, 12,985.20 and 2,811.56 is: 4,217.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,655.71 : 12,985.20 = 2,811.56 : x
  2. Step 2: Convert to fraction form
    8,655.71/12,985.20 = 2,811.56/x
  3. Step 3: Cross multiply
    8,655.71x = 12,985.20 × 2,811.56
  4. Step 4: Simplify right side
    8,655.71x = 36,508,603.99
  5. Step 5: Solve for x
    x = 36,508,603.99/8,655.71
  6. Step 6: Final answer
    x = 4,217.87

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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.