Home / 1,617.25-2,231.26-987.55

Finding the Fourth Proportional to 1,617.25, 2,231.26 and 987.55

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Solution

The fourth proportional to 1,617.25, 2,231.26 and 987.55 is: 1,362.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,617.25 : 2,231.26 = 987.55 : x
  2. Step 2: Convert to fraction form
    1,617.25/2,231.26 = 987.55/x
  3. Step 3: Cross multiply
    1,617.25x = 2,231.26 × 987.55
  4. Step 4: Simplify right side
    1,617.25x = 2,203,464.72
  5. Step 5: Solve for x
    x = 2,203,464.72/1,617.25
  6. Step 6: Final answer
    x = 1,362.48

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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.