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Finding the Fourth Proportional to 1,271.19, 1,906.97 and 405.51

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Solution

The fourth proportional to 1,271.19, 1,906.97 and 405.51 is: 608.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,271.19 : 1,906.97 = 405.51 : x
  2. Step 2: Convert to fraction form
    1,271.19/1,906.97 = 405.51/x
  3. Step 3: Cross multiply
    1,271.19x = 1,906.97 × 405.51
  4. Step 4: Simplify right side
    1,271.19x = 773,293.38
  5. Step 5: Solve for x
    x = 773,293.38/1,271.19
  6. Step 6: Final answer
    x = 608.32

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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.