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Finding the Fourth Proportional to 1,271.39, 1,906.61 and 438.22

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Solution

The fourth proportional to 1,271.39, 1,906.61 and 438.22 is: 657.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,271.39 : 1,906.61 = 438.22 : x
  2. Step 2: Convert to fraction form
    1,271.39/1,906.61 = 438.22/x
  3. Step 3: Cross multiply
    1,271.39x = 1,906.61 × 438.22
  4. Step 4: Simplify right side
    1,271.39x = 835,514.63
  5. Step 5: Solve for x
    x = 835,514.63/1,271.39
  6. Step 6: Final answer
    x = 657.17

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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.