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Finding the Fourth Proportional to 2,613.80, 3,921.18 and 858.32

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Solution

The fourth proportional to 2,613.80, 3,921.18 and 858.32 is: 1,287.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,613.80 : 3,921.18 = 858.32 : x
  2. Step 2: Convert to fraction form
    2,613.80/3,921.18 = 858.32/x
  3. Step 3: Cross multiply
    2,613.80x = 3,921.18 × 858.32
  4. Step 4: Simplify right side
    2,613.80x = 3,365,627.22
  5. Step 5: Solve for x
    x = 3,365,627.22/2,613.80
  6. Step 6: Final answer
    x = 1,287.64

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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.