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Finding the Fourth Proportional to 1,753.91, 2,419.43 and 1,221.95

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Solution

The fourth proportional to 1,753.91, 2,419.43 and 1,221.95 is: 1,685.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,753.91 : 2,419.43 = 1,221.95 : x
  2. Step 2: Convert to fraction form
    1,753.91/2,419.43 = 1,221.95/x
  3. Step 3: Cross multiply
    1,753.91x = 2,419.43 × 1,221.95
  4. Step 4: Simplify right side
    1,753.91x = 2,956,422.49
  5. Step 5: Solve for x
    x = 2,956,422.49/1,753.91
  6. Step 6: Final answer
    x = 1,685.62

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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.