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Finding the Fourth Proportional to 18,391, 25,381.89 and 10,939

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Solution

The fourth proportional to 18,391, 25,381.89 and 10,939 is: 15,097.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,391 : 25,381.89 = 10,939 : x
  2. Step 2: Convert to fraction form
    18,391/25,381.89 = 10,939/x
  3. Step 3: Cross multiply
    18,391x = 25,381.89 × 10,939
  4. Step 4: Simplify right side
    18,391x = 277,652,494.71
  5. Step 5: Solve for x
    x = 277,652,494.71/18,391
  6. Step 6: Final answer
    x = 15,097.19

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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.