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Finding the Fourth Proportional to 18,986.81, 28,490.49 and 7,901.15

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Solution

The fourth proportional to 18,986.81, 28,490.49 and 7,901.15 is: 11,856.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,986.81 : 28,490.49 = 7,901.15 : x
  2. Step 2: Convert to fraction form
    18,986.81/28,490.49 = 7,901.15/x
  3. Step 3: Cross multiply
    18,986.81x = 28,490.49 × 7,901.15
  4. Step 4: Simplify right side
    18,986.81x = 225,107,492.61
  5. Step 5: Solve for x
    x = 225,107,492.61/18,986.81
  6. Step 6: Final answer
    x = 11,856.00

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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.