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Finding the Fourth Proportional to 1,272.67, 1,909.07 and 395.20

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Solution

The fourth proportional to 1,272.67, 1,909.07 and 395.20 is: 592.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,272.67 : 1,909.07 = 395.20 : x
  2. Step 2: Convert to fraction form
    1,272.67/1,909.07 = 395.20/x
  3. Step 3: Cross multiply
    1,272.67x = 1,909.07 × 395.20
  4. Step 4: Simplify right side
    1,272.67x = 754,459.64
  5. Step 5: Solve for x
    x = 754,459.64/1,272.67
  6. Step 6: Final answer
    x = 592.81

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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.