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Finding the Fourth Proportional to 18,686.70, 25,787.43 and 10,728.72

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Solution

The fourth proportional to 18,686.70, 25,787.43 and 10,728.72 is: 14,805.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,686.70 : 25,787.43 = 10,728.72 : x
  2. Step 2: Convert to fraction form
    18,686.70/25,787.43 = 10,728.72/x
  3. Step 3: Cross multiply
    18,686.70x = 25,787.43 × 10,728.72
  4. Step 4: Simplify right side
    18,686.70x = 276,666,115.99
  5. Step 5: Solve for x
    x = 276,666,115.99/18,686.70
  6. Step 6: Final answer
    x = 14,805.51

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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.