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Finding the Fourth Proportional to 397.67, 545.84 and 380.76

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Solution

The fourth proportional to 397.67, 545.84 and 380.76 is: 522.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    397.67 : 545.84 = 380.76 : x
  2. Step 2: Convert to fraction form
    397.67/545.84 = 380.76/x
  3. Step 3: Cross multiply
    397.67x = 545.84 × 380.76
  4. Step 4: Simplify right side
    397.67x = 207,834.04
  5. Step 5: Solve for x
    x = 207,834.04/397.67
  6. Step 6: Final answer
    x = 522.63

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.