Home / 2,181.80-3,272.70-947.90

Finding the Fourth Proportional to 2,181.80, 3,272.70 and 947.90

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Solution

The fourth proportional to 2,181.80, 3,272.70 and 947.90 is: 1,421.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,181.80 : 3,272.70 = 947.90 : x
  2. Step 2: Convert to fraction form
    2,181.80/3,272.70 = 947.90/x
  3. Step 3: Cross multiply
    2,181.80x = 3,272.70 × 947.90
  4. Step 4: Simplify right side
    2,181.80x = 3,102,192.33
  5. Step 5: Solve for x
    x = 3,102,192.33/2,181.80
  6. Step 6: Final answer
    x = 1,421.85

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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.