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Finding the Fourth Proportional to 18,956.60, 28,438.20 and 7,857.20

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Solution

The fourth proportional to 18,956.60, 28,438.20 and 7,857.20 is: 11,787.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,956.60 : 28,438.20 = 7,857.20 : x
  2. Step 2: Convert to fraction form
    18,956.60/28,438.20 = 7,857.20/x
  3. Step 3: Cross multiply
    18,956.60x = 28,438.20 × 7,857.20
  4. Step 4: Simplify right side
    18,956.60x = 223,444,625.04
  5. Step 5: Solve for x
    x = 223,444,625.04/18,956.60
  6. Step 6: Final answer
    x = 11,787.17

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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.