Home / 3,989.15-5,981.99-1,215.17

Finding the Fourth Proportional to 3,989.15, 5,981.99 and 1,215.17

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Solution

The fourth proportional to 3,989.15, 5,981.99 and 1,215.17 is: 1,822.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,989.15 : 5,981.99 = 1,215.17 : x
  2. Step 2: Convert to fraction form
    3,989.15/5,981.99 = 1,215.17/x
  3. Step 3: Cross multiply
    3,989.15x = 5,981.99 × 1,215.17
  4. Step 4: Simplify right side
    3,989.15x = 7,269,131.75
  5. Step 5: Solve for x
    x = 7,269,131.75/3,989.15
  6. Step 6: Final answer
    x = 1,822.23

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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.