Home / 1,861.80-2,568.90-1,115.56

Finding the Fourth Proportional to 1,861.80, 2,568.90 and 1,115.56

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Solution

The fourth proportional to 1,861.80, 2,568.90 and 1,115.56 is: 1,539.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,861.80 : 2,568.90 = 1,115.56 : x
  2. Step 2: Convert to fraction form
    1,861.80/2,568.90 = 1,115.56/x
  3. Step 3: Cross multiply
    1,861.80x = 2,568.90 × 1,115.56
  4. Step 4: Simplify right side
    1,861.80x = 2,865,762.08
  5. Step 5: Solve for x
    x = 2,865,762.08/1,861.80
  6. Step 6: Final answer
    x = 1,539.24

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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.