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Finding the Fourth Proportional to 18,971.31, 28,467.24 and 7,885.65

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Solution

The fourth proportional to 18,971.31, 28,467.24 and 7,885.65 is: 11,832.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,971.31 : 28,467.24 = 7,885.65 : x
  2. Step 2: Convert to fraction form
    18,971.31/28,467.24 = 7,885.65/x
  3. Step 3: Cross multiply
    18,971.31x = 28,467.24 × 7,885.65
  4. Step 4: Simplify right side
    18,971.31x = 224,482,691.11
  5. Step 5: Solve for x
    x = 224,482,691.11/18,971.31
  6. Step 6: Final answer
    x = 11,832.75

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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.