Home / 3,988.90-5,504.79-2,220.40

Finding the Fourth Proportional to 3,988.90, 5,504.79 and 2,220.40

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Solution

The fourth proportional to 3,988.90, 5,504.79 and 2,220.40 is: 3,064.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,988.90 : 5,504.79 = 2,220.40 : x
  2. Step 2: Convert to fraction form
    3,988.90/5,504.79 = 2,220.40/x
  3. Step 3: Cross multiply
    3,988.90x = 5,504.79 × 2,220.40
  4. Step 4: Simplify right side
    3,988.90x = 12,222,835.72
  5. Step 5: Solve for x
    x = 12,222,835.72/3,988.90
  6. Step 6: Final answer
    x = 3,064.21

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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.