Home / 3,990.90-5,506.80-2,312.46

Finding the Fourth Proportional to 3,990.90, 5,506.80 and 2,312.46

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Solution

The fourth proportional to 3,990.90, 5,506.80 and 2,312.46 is: 3,190.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,990.90 : 5,506.80 = 2,312.46 : x
  2. Step 2: Convert to fraction form
    3,990.90/5,506.80 = 2,312.46/x
  3. Step 3: Cross multiply
    3,990.90x = 5,506.80 × 2,312.46
  4. Step 4: Simplify right side
    3,990.90x = 12,734,254.73
  5. Step 5: Solve for x
    x = 12,734,254.73/3,990.90
  6. Step 6: Final answer
    x = 3,190.82

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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.