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Finding the Fourth Proportional to 15,808.43, 21,815.38 and 8,638.19

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Solution

The fourth proportional to 15,808.43, 21,815.38 and 8,638.19 is: 11,920.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,808.43 : 21,815.38 = 8,638.19 : x
  2. Step 2: Convert to fraction form
    15,808.43/21,815.38 = 8,638.19/x
  3. Step 3: Cross multiply
    15,808.43x = 21,815.38 × 8,638.19
  4. Step 4: Simplify right side
    15,808.43x = 188,445,430.31
  5. Step 5: Solve for x
    x = 188,445,430.31/15,808.43
  6. Step 6: Final answer
    x = 11,920.56

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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.