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Finding the Fourth Proportional to 3,908.90, 5,863.32 and 987.19

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Solution

The fourth proportional to 3,908.90, 5,863.32 and 987.19 is: 1,480.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,908.90 : 5,863.32 = 987.19 : x
  2. Step 2: Convert to fraction form
    3,908.90/5,863.32 = 987.19/x
  3. Step 3: Cross multiply
    3,908.90x = 5,863.32 × 987.19
  4. Step 4: Simplify right side
    3,908.90x = 5,788,196.21
  5. Step 5: Solve for x
    x = 5,788,196.21/3,908.90
  6. Step 6: Final answer
    x = 1,480.77

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1.5x scale

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.