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Finding the Fourth Proportional to 395.39, 545.34 and 290.44

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Solution

The fourth proportional to 395.39, 545.34 and 290.44 is: 400.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    395.39 : 545.34 = 290.44 : x
  2. Step 2: Convert to fraction form
    395.39/545.34 = 290.44/x
  3. Step 3: Cross multiply
    395.39x = 545.34 × 290.44
  4. Step 4: Simplify right side
    395.39x = 158,387.19
  5. Step 5: Solve for x
    x = 158,387.19/395.39
  6. Step 6: Final answer
    x = 400.59

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.