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Finding the Fourth Proportional to 1,272.90, 1,908.81 and 407.10

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Solution

The fourth proportional to 1,272.90, 1,908.81 and 407.10 is: 610.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,272.90 : 1,908.81 = 407.10 : x
  2. Step 2: Convert to fraction form
    1,272.90/1,908.81 = 407.10/x
  3. Step 3: Cross multiply
    1,272.90x = 1,908.81 × 407.10
  4. Step 4: Simplify right side
    1,272.90x = 777,076.55
  5. Step 5: Solve for x
    x = 777,076.55/1,272.90
  6. Step 6: Final answer
    x = 610.48

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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.