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Finding the Fourth Proportional to 18,917.65, 26,106.11 and 10,419.61

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Solution

The fourth proportional to 18,917.65, 26,106.11 and 10,419.61 is: 14,378.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,917.65 : 26,106.11 = 10,419.61 : x
  2. Step 2: Convert to fraction form
    18,917.65/26,106.11 = 10,419.61/x
  3. Step 3: Cross multiply
    18,917.65x = 26,106.11 × 10,419.61
  4. Step 4: Simplify right side
    18,917.65x = 272,015,302.19
  5. Step 5: Solve for x
    x = 272,015,302.19/18,917.65
  6. Step 6: Final answer
    x = 14,378.92

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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.