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Finding the Fourth Proportional to 18,961.50, 28,442.25 and 5,110.50

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Solution

The fourth proportional to 18,961.50, 28,442.25 and 5,110.50 is: 7,665.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,961.50 : 28,442.25 = 5,110.50 : x
  2. Step 2: Convert to fraction form
    18,961.50/28,442.25 = 5,110.50/x
  3. Step 3: Cross multiply
    18,961.50x = 28,442.25 × 5,110.50
  4. Step 4: Simplify right side
    18,961.50x = 145,354,118.63
  5. Step 5: Solve for x
    x = 145,354,118.63/18,961.50
  6. Step 6: Final answer
    x = 7,665.75

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.