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Finding the Fourth Proportional to 18,969.34, 28,490.90 and 15,461.92

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Solution

The fourth proportional to 18,969.34, 28,490.90 and 15,461.92 is: 23,222.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,969.34 : 28,490.90 = 15,461.92 : x
  2. Step 2: Convert to fraction form
    18,969.34/28,490.90 = 15,461.92/x
  3. Step 3: Cross multiply
    18,969.34x = 28,490.90 × 15,461.92
  4. Step 4: Simplify right side
    18,969.34x = 440,524,016.53
  5. Step 5: Solve for x
    x = 440,524,016.53/18,969.34
  6. Step 6: Final answer
    x = 23,222.95

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1.5x scale

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.