Home / 1,640.28-2,263.38-931.86

Finding the Fourth Proportional to 1,640.28, 2,263.38 and 931.86

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Solution

The fourth proportional to 1,640.28, 2,263.38 and 931.86 is: 1,285.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,640.28 : 2,263.38 = 931.86 : x
  2. Step 2: Convert to fraction form
    1,640.28/2,263.38 = 931.86/x
  3. Step 3: Cross multiply
    1,640.28x = 2,263.38 × 931.86
  4. Step 4: Simplify right side
    1,640.28x = 2,109,153.29
  5. Step 5: Solve for x
    x = 2,109,153.29/1,640.28
  6. Step 6: Final answer
    x = 1,285.85

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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.