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Finding the Fourth Proportional to 3,990.78, 5,980.91 and 2,235.74

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Solution

The fourth proportional to 3,990.78, 5,980.91 and 2,235.74 is: 3,350.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,990.78 : 5,980.91 = 2,235.74 : x
  2. Step 2: Convert to fraction form
    3,990.78/5,980.91 = 2,235.74/x
  3. Step 3: Cross multiply
    3,990.78x = 5,980.91 × 2,235.74
  4. Step 4: Simplify right side
    3,990.78x = 13,371,718.64
  5. Step 5: Solve for x
    x = 13,371,718.64/3,990.78
  6. Step 6: Final answer
    x = 3,350.65

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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.