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Finding the Fourth Proportional to 12,655.68, 18,965.05 and 8,955.90

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Solution

The fourth proportional to 12,655.68, 18,965.05 and 8,955.90 is: 13,420.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,655.68 : 18,965.05 = 8,955.90 : x
  2. Step 2: Convert to fraction form
    12,655.68/18,965.05 = 8,955.90/x
  3. Step 3: Cross multiply
    12,655.68x = 18,965.05 × 8,955.90
  4. Step 4: Simplify right side
    12,655.68x = 169,849,091.30
  5. Step 5: Solve for x
    x = 169,849,091.30/12,655.68
  6. Step 6: Final answer
    x = 13,420.78

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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.