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Finding the Fourth Proportional to 18,758.40, 25,889.40 and 11,687.10

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Solution

The fourth proportional to 18,758.40, 25,889.40 and 11,687.10 is: 16,129.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,758.40 : 25,889.40 = 11,687.10 : x
  2. Step 2: Convert to fraction form
    18,758.40/25,889.40 = 11,687.10/x
  3. Step 3: Cross multiply
    18,758.40x = 25,889.40 × 11,687.10
  4. Step 4: Simplify right side
    18,758.40x = 302,572,006.74
  5. Step 5: Solve for x
    x = 302,572,006.74/18,758.40
  6. Step 6: Final answer
    x = 16,129.95

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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.