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Finding the Fourth Proportional to 395.43, 545.75 and 238.15

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Solution

The fourth proportional to 395.43, 545.75 and 238.15 is: 328.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    395.43 : 545.75 = 238.15 : x
  2. Step 2: Convert to fraction form
    395.43/545.75 = 238.15/x
  3. Step 3: Cross multiply
    395.43x = 545.75 × 238.15
  4. Step 4: Simplify right side
    395.43x = 129,967.01
  5. Step 5: Solve for x
    x = 129,967.01/395.43
  6. Step 6: Final answer
    x = 328.67

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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.