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Finding the Fourth Proportional to 18,687.51, 25,787.79 and 10,189.20

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Solution

The fourth proportional to 18,687.51, 25,787.79 and 10,189.20 is: 14,060.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,687.51 : 25,787.79 = 10,189.20 : x
  2. Step 2: Convert to fraction form
    18,687.51/25,787.79 = 10,189.20/x
  3. Step 3: Cross multiply
    18,687.51x = 25,787.79 × 10,189.20
  4. Step 4: Simplify right side
    18,687.51x = 262,756,949.87
  5. Step 5: Solve for x
    x = 262,756,949.87/18,687.51
  6. Step 6: Final answer
    x = 14,060.57

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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.