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Finding the Fourth Proportional to 545.57, 752.78 and 379.72

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Solution

The fourth proportional to 545.57, 752.78 and 379.72 is: 523.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    545.57 : 752.78 = 379.72 : x
  2. Step 2: Convert to fraction form
    545.57/752.78 = 379.72/x
  3. Step 3: Cross multiply
    545.57x = 752.78 × 379.72
  4. Step 4: Simplify right side
    545.57x = 285,841.84
  5. Step 5: Solve for x
    x = 285,841.84/545.57
  6. Step 6: Final answer
    x = 523.94

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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.