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Finding the Fourth Proportional to 3,239.76, 4,471.50 and 1,913.40

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Solution

The fourth proportional to 3,239.76, 4,471.50 and 1,913.40 is: 2,640.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,239.76 : 4,471.50 = 1,913.40 : x
  2. Step 2: Convert to fraction form
    3,239.76/4,471.50 = 1,913.40/x
  3. Step 3: Cross multiply
    3,239.76x = 4,471.50 × 1,913.40
  4. Step 4: Simplify right side
    3,239.76x = 8,555,768.10
  5. Step 5: Solve for x
    x = 8,555,768.10/3,239.76
  6. Step 6: Final answer
    x = 2,640.86

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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.