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Finding the Fourth Proportional to 1,272.69, 1,909.10 and 395.27

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Solution

The fourth proportional to 1,272.69, 1,909.10 and 395.27 is: 592.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,272.69 : 1,909.10 = 395.27 : x
  2. Step 2: Convert to fraction form
    1,272.69/1,909.10 = 395.27/x
  3. Step 3: Cross multiply
    1,272.69x = 1,909.10 × 395.27
  4. Step 4: Simplify right side
    1,272.69x = 754,609.96
  5. Step 5: Solve for x
    x = 754,609.96/1,272.69
  6. Step 6: Final answer
    x = 592.93

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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.