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Finding the Fourth Proportional to 1,272.98, 1,909.59 and 395.49

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Solution

The fourth proportional to 1,272.98, 1,909.59 and 395.49 is: 593.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,272.98 : 1,909.59 = 395.49 : x
  2. Step 2: Convert to fraction form
    1,272.98/1,909.59 = 395.49/x
  3. Step 3: Cross multiply
    1,272.98x = 1,909.59 × 395.49
  4. Step 4: Simplify right side
    1,272.98x = 755,223.75
  5. Step 5: Solve for x
    x = 755,223.75/1,272.98
  6. Step 6: Final answer
    x = 593.27

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1.5x scale

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.