Home / 2,311.20-3,189.48-1,780.65

Finding the Fourth Proportional to 2,311.20, 3,189.48 and 1,780.65

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Solution

The fourth proportional to 2,311.20, 3,189.48 and 1,780.65 is: 2,457.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,311.20 : 3,189.48 = 1,780.65 : x
  2. Step 2: Convert to fraction form
    2,311.20/3,189.48 = 1,780.65/x
  3. Step 3: Cross multiply
    2,311.20x = 3,189.48 × 1,780.65
  4. Step 4: Simplify right side
    2,311.20x = 5,679,347.56
  5. Step 5: Solve for x
    x = 5,679,347.56/2,311.20
  6. Step 6: Final answer
    x = 2,457.32

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1.5x scale

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.