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Finding the Fourth Proportional to 2,479.80, 3,420.72 and 1,431.68

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Solution

The fourth proportional to 2,479.80, 3,420.72 and 1,431.68 is: 1,974.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,479.80 : 3,420.72 = 1,431.68 : x
  2. Step 2: Convert to fraction form
    2,479.80/3,420.72 = 1,431.68/x
  3. Step 3: Cross multiply
    2,479.80x = 3,420.72 × 1,431.68
  4. Step 4: Simplify right side
    2,479.80x = 4,897,376.41
  5. Step 5: Solve for x
    x = 4,897,376.41/2,479.80
  6. Step 6: Final answer
    x = 1,974.91

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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.