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Finding the Fourth Proportional to 395.13, 545.05 and 245.81

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Solution

The fourth proportional to 395.13, 545.05 and 245.81 is: 339.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    395.13 : 545.05 = 245.81 : x
  2. Step 2: Convert to fraction form
    395.13/545.05 = 245.81/x
  3. Step 3: Cross multiply
    395.13x = 545.05 × 245.81
  4. Step 4: Simplify right side
    395.13x = 133,978.74
  5. Step 5: Solve for x
    x = 133,978.74/395.13
  6. Step 6: Final answer
    x = 339.08

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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.