Home / 1,611.20-2,223.68-981.76

Finding the Fourth Proportional to 1,611.20, 2,223.68 and 981.76

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Solution

The fourth proportional to 1,611.20, 2,223.68 and 981.76 is: 1,354.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,611.20 : 2,223.68 = 981.76 : x
  2. Step 2: Convert to fraction form
    1,611.20/2,223.68 = 981.76/x
  3. Step 3: Cross multiply
    1,611.20x = 2,223.68 × 981.76
  4. Step 4: Simplify right side
    1,611.20x = 2,183,120.08
  5. Step 5: Solve for x
    x = 2,183,120.08/1,611.20
  6. Step 6: Final answer
    x = 1,354.97

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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.