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Finding the Fourth Proportional to 2,587.42, 3,881.13 and 639.60

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Solution

The fourth proportional to 2,587.42, 3,881.13 and 639.60 is: 959.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,587.42 : 3,881.13 = 639.60 : x
  2. Step 2: Convert to fraction form
    2,587.42/3,881.13 = 639.60/x
  3. Step 3: Cross multiply
    2,587.42x = 3,881.13 × 639.60
  4. Step 4: Simplify right side
    2,587.42x = 2,482,370.75
  5. Step 5: Solve for x
    x = 2,482,370.75/2,587.42
  6. Step 6: Final answer
    x = 959.40

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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.