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Finding the Fourth Proportional to 2,613.20, 3,919.80 and 858.20

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Solution

The fourth proportional to 2,613.20, 3,919.80 and 858.20 is: 1,287.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,613.20 : 3,919.80 = 858.20 : x
  2. Step 2: Convert to fraction form
    2,613.20/3,919.80 = 858.20/x
  3. Step 3: Cross multiply
    2,613.20x = 3,919.80 × 858.20
  4. Step 4: Simplify right side
    2,613.20x = 3,363,972.36
  5. Step 5: Solve for x
    x = 3,363,972.36/2,613.20
  6. Step 6: Final answer
    x = 1,287.30

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.