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Finding the Fourth Proportional to 15,135.50, 20,887.08 and 8,511.50

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Solution

The fourth proportional to 15,135.50, 20,887.08 and 8,511.50 is: 11,745.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,135.50 : 20,887.08 = 8,511.50 : x
  2. Step 2: Convert to fraction form
    15,135.50/20,887.08 = 8,511.50/x
  3. Step 3: Cross multiply
    15,135.50x = 20,887.08 × 8,511.50
  4. Step 4: Simplify right side
    15,135.50x = 177,780,381.42
  5. Step 5: Solve for x
    x = 177,780,381.42/15,135.50
  6. Step 6: Final answer
    x = 11,745.92

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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.