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Finding the Fourth Proportional to 3,471.21, 4,789.51 and 1,978.72

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Solution

The fourth proportional to 3,471.21, 4,789.51 and 1,978.72 is: 2,730.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,471.21 : 4,789.51 = 1,978.72 : x
  2. Step 2: Convert to fraction form
    3,471.21/4,789.51 = 1,978.72/x
  3. Step 3: Cross multiply
    3,471.21x = 4,789.51 × 1,978.72
  4. Step 4: Simplify right side
    3,471.21x = 9,477,099.23
  5. Step 5: Solve for x
    x = 9,477,099.23/3,471.21
  6. Step 6: Final answer
    x = 2,730.20

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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.