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Finding the Fourth Proportional to 545.67, 818.78 and 399.57

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Solution

The fourth proportional to 545.67, 818.78 and 399.57 is: 599.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    545.67 : 818.78 = 399.57 : x
  2. Step 2: Convert to fraction form
    545.67/818.78 = 399.57/x
  3. Step 3: Cross multiply
    545.67x = 818.78 × 399.57
  4. Step 4: Simplify right side
    545.67x = 327,154.86
  5. Step 5: Solve for x
    x = 327,154.86/545.67
  6. Step 6: Final answer
    x = 599.55

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.