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Finding the Fourth Proportional to 2,587.07, 3,880.55 and 639.27

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Solution

The fourth proportional to 2,587.07, 3,880.55 and 639.27 is: 958.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,587.07 : 3,880.55 = 639.27 : x
  2. Step 2: Convert to fraction form
    2,587.07/3,880.55 = 639.27/x
  3. Step 3: Cross multiply
    2,587.07x = 3,880.55 × 639.27
  4. Step 4: Simplify right side
    2,587.07x = 2,480,716.00
  5. Step 5: Solve for x
    x = 2,480,716.00/2,587.07
  6. Step 6: Final answer
    x = 958.89

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.