Home / 2,587.11-3,880.63-639.32

Finding the Fourth Proportional to 2,587.11, 3,880.63 and 639.32

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Solution

The fourth proportional to 2,587.11, 3,880.63 and 639.32 is: 958.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,587.11 : 3,880.63 = 639.32 : x
  2. Step 2: Convert to fraction form
    2,587.11/3,880.63 = 639.32/x
  3. Step 3: Cross multiply
    2,587.11x = 3,880.63 × 639.32
  4. Step 4: Simplify right side
    2,587.11x = 2,480,958.48
  5. Step 5: Solve for x
    x = 2,480,958.48/2,587.11
  6. Step 6: Final answer
    x = 958.97

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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.