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Finding the Fourth Proportional to 3,397.81, 4,689.20 and 1,905.83

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Solution

The fourth proportional to 3,397.81, 4,689.20 and 1,905.83 is: 2,630.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,397.81 : 4,689.20 = 1,905.83 : x
  2. Step 2: Convert to fraction form
    3,397.81/4,689.20 = 1,905.83/x
  3. Step 3: Cross multiply
    3,397.81x = 4,689.20 × 1,905.83
  4. Step 4: Simplify right side
    3,397.81x = 8,936,818.04
  5. Step 5: Solve for x
    x = 8,936,818.04/3,397.81
  6. Step 6: Final answer
    x = 2,630.17

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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.