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Finding the Fourth Proportional to 545.28, 818.10 and 429.78

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Solution

The fourth proportional to 545.28, 818.10 and 429.78 is: 644.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    545.28 : 818.10 = 429.78 : x
  2. Step 2: Convert to fraction form
    545.28/818.10 = 429.78/x
  3. Step 3: Cross multiply
    545.28x = 818.10 × 429.78
  4. Step 4: Simplify right side
    545.28x = 351,603.02
  5. Step 5: Solve for x
    x = 351,603.02/545.28
  6. Step 6: Final answer
    x = 644.81

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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.