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Finding the Fourth Proportional to 15,878.79, 21,912.66 and 8,805.20

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Solution

The fourth proportional to 15,878.79, 21,912.66 and 8,805.20 is: 12,151.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,878.79 : 21,912.66 = 8,805.20 : x
  2. Step 2: Convert to fraction form
    15,878.79/21,912.66 = 8,805.20/x
  3. Step 3: Cross multiply
    15,878.79x = 21,912.66 × 8,805.20
  4. Step 4: Simplify right side
    15,878.79x = 192,945,244.27
  5. Step 5: Solve for x
    x = 192,945,244.27/15,878.79
  6. Step 6: Final answer
    x = 12,151.13

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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.