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Finding the Fourth Proportional to 14,978.11, 20,669.70 and 8,263.69

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Solution

The fourth proportional to 14,978.11, 20,669.70 and 8,263.69 is: 11,403.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,978.11 : 20,669.70 = 8,263.69 : x
  2. Step 2: Convert to fraction form
    14,978.11/20,669.70 = 8,263.69/x
  3. Step 3: Cross multiply
    14,978.11x = 20,669.70 × 8,263.69
  4. Step 4: Simplify right side
    14,978.11x = 170,807,993.19
  5. Step 5: Solve for x
    x = 170,807,993.19/14,978.11
  6. Step 6: Final answer
    x = 11,403.84

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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.