Home / 2,587.10-3,880.60-639.30

Finding the Fourth Proportional to 2,587.10, 3,880.60 and 639.30

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Solution

The fourth proportional to 2,587.10, 3,880.60 and 639.30 is: 958.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,587.10 : 3,880.60 = 639.30 : x
  2. Step 2: Convert to fraction form
    2,587.10/3,880.60 = 639.30/x
  3. Step 3: Cross multiply
    2,587.10x = 3,880.60 × 639.30
  4. Step 4: Simplify right side
    2,587.10x = 2,480,864.38
  5. Step 5: Solve for x
    x = 2,480,864.38/2,587.10
  6. Step 6: Final answer
    x = 958.94

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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.