Home / 3,970.80-5,479.41-2,177.98

Finding the Fourth Proportional to 3,970.80, 5,479.41 and 2,177.98

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Solution

The fourth proportional to 3,970.80, 5,479.41 and 2,177.98 is: 3,005.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,970.80 : 5,479.41 = 2,177.98 : x
  2. Step 2: Convert to fraction form
    3,970.80/5,479.41 = 2,177.98/x
  3. Step 3: Cross multiply
    3,970.80x = 5,479.41 × 2,177.98
  4. Step 4: Simplify right side
    3,970.80x = 11,934,045.39
  5. Step 5: Solve for x
    x = 11,934,045.39/3,970.80
  6. Step 6: Final answer
    x = 3,005.45

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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.