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Finding the Fourth Proportional to 1,369.65, 2,053.86 and 639.44

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Solution

The fourth proportional to 1,369.65, 2,053.86 and 639.44 is: 958.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,369.65 : 2,053.86 = 639.44 : x
  2. Step 2: Convert to fraction form
    1,369.65/2,053.86 = 639.44/x
  3. Step 3: Cross multiply
    1,369.65x = 2,053.86 × 639.44
  4. Step 4: Simplify right side
    1,369.65x = 1,313,320.24
  5. Step 5: Solve for x
    x = 1,313,320.24/1,369.65
  6. Step 6: Final answer
    x = 958.87

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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.