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Finding the Fourth Proportional to 1,339.10, 2,007.14 and 644.74

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Solution

The fourth proportional to 1,339.10, 2,007.14 and 644.74 is: 966.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,339.10 : 2,007.14 = 644.74 : x
  2. Step 2: Convert to fraction form
    1,339.10/2,007.14 = 644.74/x
  3. Step 3: Cross multiply
    1,339.10x = 2,007.14 × 644.74
  4. Step 4: Simplify right side
    1,339.10x = 1,294,083.44
  5. Step 5: Solve for x
    x = 1,294,083.44/1,339.10
  6. Step 6: Final answer
    x = 966.38

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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.