Home / 3,989.19-5,505.08-2,220.78

Finding the Fourth Proportional to 3,989.19, 5,505.08 and 2,220.78

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Solution

The fourth proportional to 3,989.19, 5,505.08 and 2,220.78 is: 3,064.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,989.19 : 5,505.08 = 2,220.78 : x
  2. Step 2: Convert to fraction form
    3,989.19/5,505.08 = 2,220.78/x
  3. Step 3: Cross multiply
    3,989.19x = 5,505.08 × 2,220.78
  4. Step 4: Simplify right side
    3,989.19x = 12,225,560.46
  5. Step 5: Solve for x
    x = 12,225,560.46/3,989.19
  6. Step 6: Final answer
    x = 3,064.67

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Double scale
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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.