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Finding the Fourth Proportional to 3,970.76, 5,479.80 and 2,974.28

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Solution

The fourth proportional to 3,970.76, 5,479.80 and 2,974.28 is: 4,104.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,970.76 : 5,479.80 = 2,974.28 : x
  2. Step 2: Convert to fraction form
    3,970.76/5,479.80 = 2,974.28/x
  3. Step 3: Cross multiply
    3,970.76x = 5,479.80 × 2,974.28
  4. Step 4: Simplify right side
    3,970.76x = 16,298,459.54
  5. Step 5: Solve for x
    x = 16,298,459.54/3,970.76
  6. Step 6: Final answer
    x = 4,104.62

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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.