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Finding the Fourth Proportional to 15,492.61, 21,375.22 and 8,778.09

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Solution

The fourth proportional to 15,492.61, 21,375.22 and 8,778.09 is: 12,111.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,492.61 : 21,375.22 = 8,778.09 : x
  2. Step 2: Convert to fraction form
    15,492.61/21,375.22 = 8,778.09/x
  3. Step 3: Cross multiply
    15,492.61x = 21,375.22 × 8,778.09
  4. Step 4: Simplify right side
    15,492.61x = 187,633,604.93
  5. Step 5: Solve for x
    x = 187,633,604.93/15,492.61
  6. Step 6: Final answer
    x = 12,111.17

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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.