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Finding the Fourth Proportional to 13,312.78, 18,363.49 and 8,531.11

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Solution

The fourth proportional to 13,312.78, 18,363.49 and 8,531.11 is: 11,767.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,312.78 : 18,363.49 = 8,531.11 : x
  2. Step 2: Convert to fraction form
    13,312.78/18,363.49 = 8,531.11/x
  3. Step 3: Cross multiply
    13,312.78x = 18,363.49 × 8,531.11
  4. Step 4: Simplify right side
    13,312.78x = 156,660,885.94
  5. Step 5: Solve for x
    x = 156,660,885.94/13,312.78
  6. Step 6: Final answer
    x = 11,767.71

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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.