Home / 3,989.48-5,981.52-1,391

Finding the Fourth Proportional to 3,989.48, 5,981.52 and 1,391

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Solution

The fourth proportional to 3,989.48, 5,981.52 and 1,391 is: 2,085.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,989.48 : 5,981.52 = 1,391 : x
  2. Step 2: Convert to fraction form
    3,989.48/5,981.52 = 1,391/x
  3. Step 3: Cross multiply
    3,989.48x = 5,981.52 × 1,391
  4. Step 4: Simplify right side
    3,989.48x = 8,320,294.32
  5. Step 5: Solve for x
    x = 8,320,294.32/3,989.48
  6. Step 6: Final answer
    x = 2,085.56

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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.