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Finding the Fourth Proportional to 15,861.75, 21,888.33 and 8,690.33

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Solution

The fourth proportional to 15,861.75, 21,888.33 and 8,690.33 is: 11,992.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,861.75 : 21,888.33 = 8,690.33 : x
  2. Step 2: Convert to fraction form
    15,861.75/21,888.33 = 8,690.33/x
  3. Step 3: Cross multiply
    15,861.75x = 21,888.33 × 8,690.33
  4. Step 4: Simplify right side
    15,861.75x = 190,216,701.41
  5. Step 5: Solve for x
    x = 190,216,701.41/15,861.75
  6. Step 6: Final answer
    x = 11,992.16

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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.