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Finding the Fourth Proportional to 545.77, 818.80 and 285.90

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Solution

The fourth proportional to 545.77, 818.80 and 285.90 is: 428.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    545.77 : 818.80 = 285.90 : x
  2. Step 2: Convert to fraction form
    545.77/818.80 = 285.90/x
  3. Step 3: Cross multiply
    545.77x = 818.80 × 285.90
  4. Step 4: Simplify right side
    545.77x = 234,094.92
  5. Step 5: Solve for x
    x = 234,094.92/545.77
  6. Step 6: Final answer
    x = 428.93

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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.