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Finding the Fourth Proportional to 1,943.31, 2,914.59 and 644.61

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Solution

The fourth proportional to 1,943.31, 2,914.59 and 644.61 is: 966.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,943.31 : 2,914.59 = 644.61 : x
  2. Step 2: Convert to fraction form
    1,943.31/2,914.59 = 644.61/x
  3. Step 3: Cross multiply
    1,943.31x = 2,914.59 × 644.61
  4. Step 4: Simplify right side
    1,943.31x = 1,878,773.86
  5. Step 5: Solve for x
    x = 1,878,773.86/1,943.31
  6. Step 6: Final answer
    x = 966.79

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.