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Finding the Fourth Proportional to 3,989.01, 5,505 and 2,220.63

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Solution

The fourth proportional to 3,989.01, 5,505 and 2,220.63 is: 3,064.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,989.01 : 5,505 = 2,220.63 : x
  2. Step 2: Convert to fraction form
    3,989.01/5,505 = 2,220.63/x
  3. Step 3: Cross multiply
    3,989.01x = 5,505 × 2,220.63
  4. Step 4: Simplify right side
    3,989.01x = 12,224,568.15
  5. Step 5: Solve for x
    x = 12,224,568.15/3,989.01
  6. Step 6: Final answer
    x = 3,064.56

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.