Home / 20,787.86-31,181.70-5,205.44

Finding the Fourth Proportional to 20,787.86, 31,181.70 and 5,205.44

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Solution

The fourth proportional to 20,787.86, 31,181.70 and 5,205.44 is: 7,808.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,787.86 : 31,181.70 = 5,205.44 : x
  2. Step 2: Convert to fraction form
    20,787.86/31,181.70 = 5,205.44/x
  3. Step 3: Cross multiply
    20,787.86x = 31,181.70 × 5,205.44
  4. Step 4: Simplify right side
    20,787.86x = 162,314,468.45
  5. Step 5: Solve for x
    x = 162,314,468.45/20,787.86
  6. Step 6: Final answer
    x = 7,808.14

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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.