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Finding the Fourth Proportional to 395.95, 545.29 and 387.47

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Solution

The fourth proportional to 395.95, 545.29 and 387.47 is: 533.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    395.95 : 545.29 = 387.47 : x
  2. Step 2: Convert to fraction form
    395.95/545.29 = 387.47/x
  3. Step 3: Cross multiply
    395.95x = 545.29 × 387.47
  4. Step 4: Simplify right side
    395.95x = 211,281.58
  5. Step 5: Solve for x
    x = 211,281.58/395.95
  6. Step 6: Final answer
    x = 533.61

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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.