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Finding the Fourth Proportional to 3,992.88, 5,988.95 and 1,220.21

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Solution

The fourth proportional to 3,992.88, 5,988.95 and 1,220.21 is: 1,830.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,992.88 : 5,988.95 = 1,220.21 : x
  2. Step 2: Convert to fraction form
    3,992.88/5,988.95 = 1,220.21/x
  3. Step 3: Cross multiply
    3,992.88x = 5,988.95 × 1,220.21
  4. Step 4: Simplify right side
    3,992.88x = 7,307,776.68
  5. Step 5: Solve for x
    x = 7,307,776.68/3,992.88
  6. Step 6: Final answer
    x = 1,830.20

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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.