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Finding the Fourth Proportional to 18,879.97, 28,325.57 and 7,787.32

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Solution

The fourth proportional to 18,879.97, 28,325.57 and 7,787.32 is: 11,683.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,879.97 : 28,325.57 = 7,787.32 : x
  2. Step 2: Convert to fraction form
    18,879.97/28,325.57 = 7,787.32/x
  3. Step 3: Cross multiply
    18,879.97x = 28,325.57 × 7,787.32
  4. Step 4: Simplify right side
    18,879.97x = 220,580,371.16
  5. Step 5: Solve for x
    x = 220,580,371.16/18,879.97
  6. Step 6: Final answer
    x = 11,683.30

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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.