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Finding the Fourth Proportional to 3,987.92, 5,981.70 and 1,355.32

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Solution

The fourth proportional to 3,987.92, 5,981.70 and 1,355.32 is: 2,032.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,987.92 : 5,981.70 = 1,355.32 : x
  2. Step 2: Convert to fraction form
    3,987.92/5,981.70 = 1,355.32/x
  3. Step 3: Cross multiply
    3,987.92x = 5,981.70 × 1,355.32
  4. Step 4: Simplify right side
    3,987.92x = 8,107,088.93
  5. Step 5: Solve for x
    x = 8,107,088.93/3,987.92
  6. Step 6: Final answer
    x = 2,032.91

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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.