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Finding the Fourth Proportional to 1,296.41, 1,942.71 and 638.09

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Solution

The fourth proportional to 1,296.41, 1,942.71 and 638.09 is: 956.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,296.41 : 1,942.71 = 638.09 : x
  2. Step 2: Convert to fraction form
    1,296.41/1,942.71 = 638.09/x
  3. Step 3: Cross multiply
    1,296.41x = 1,942.71 × 638.09
  4. Step 4: Simplify right side
    1,296.41x = 1,239,614.11
  5. Step 5: Solve for x
    x = 1,239,614.11/1,296.41
  6. Step 6: Final answer
    x = 956.19

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1.5x scale

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.