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Finding the Fourth Proportional to 18,381.99, 25,371.65 and 10,428.87

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Solution

The fourth proportional to 18,381.99, 25,371.65 and 10,428.87 is: 14,394.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,381.99 : 25,371.65 = 10,428.87 : x
  2. Step 2: Convert to fraction form
    18,381.99/25,371.65 = 10,428.87/x
  3. Step 3: Cross multiply
    18,381.99x = 25,371.65 × 10,428.87
  4. Step 4: Simplify right side
    18,381.99x = 264,597,665.61
  5. Step 5: Solve for x
    x = 264,597,665.61/18,381.99
  6. Step 6: Final answer
    x = 14,394.40

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1.5x scale

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.