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Finding the Fourth Proportional to 545.85, 818.79 and 455.19

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Solution

The fourth proportional to 545.85, 818.79 and 455.19 is: 682.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    545.85 : 818.79 = 455.19 : x
  2. Step 2: Convert to fraction form
    545.85/818.79 = 455.19/x
  3. Step 3: Cross multiply
    545.85x = 818.79 × 455.19
  4. Step 4: Simplify right side
    545.85x = 372,705.02
  5. Step 5: Solve for x
    x = 372,705.02/545.85
  6. Step 6: Final answer
    x = 682.80

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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.