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Finding the Fourth Proportional to 2,618.80, 3,613.80 and 1,439.66

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Solution

The fourth proportional to 2,618.80, 3,613.80 and 1,439.66 is: 1,986.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,618.80 : 3,613.80 = 1,439.66 : x
  2. Step 2: Convert to fraction form
    2,618.80/3,613.80 = 1,439.66/x
  3. Step 3: Cross multiply
    2,618.80x = 3,613.80 × 1,439.66
  4. Step 4: Simplify right side
    2,618.80x = 5,202,643.31
  5. Step 5: Solve for x
    x = 5,202,643.31/2,618.80
  6. Step 6: Final answer
    x = 1,986.65

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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.