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Finding the Fourth Proportional to 15,861.54, 21,888.87 and 8,787.96

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Solution

The fourth proportional to 15,861.54, 21,888.87 and 8,787.96 is: 12,127.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,861.54 : 21,888.87 = 8,787.96 : x
  2. Step 2: Convert to fraction form
    15,861.54/21,888.87 = 8,787.96/x
  3. Step 3: Cross multiply
    15,861.54x = 21,888.87 × 8,787.96
  4. Step 4: Simplify right side
    15,861.54x = 192,358,514.01
  5. Step 5: Solve for x
    x = 192,358,514.01/15,861.54
  6. Step 6: Final answer
    x = 12,127.35

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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.