Home / 3,970.77-5,479.72-2,178.41

Finding the Fourth Proportional to 3,970.77, 5,479.72 and 2,178.41

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Solution

The fourth proportional to 3,970.77, 5,479.72 and 2,178.41 is: 3,006.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,970.77 : 5,479.72 = 2,178.41 : x
  2. Step 2: Convert to fraction form
    3,970.77/5,479.72 = 2,178.41/x
  3. Step 3: Cross multiply
    3,970.77x = 5,479.72 × 2,178.41
  4. Step 4: Simplify right side
    3,970.77x = 11,937,076.85
  5. Step 5: Solve for x
    x = 11,937,076.85/3,970.77
  6. Step 6: Final answer
    x = 3,006.24

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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.