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Finding the Fourth Proportional to 545.10, 815.58 and 324.90

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Solution

The fourth proportional to 545.10, 815.58 and 324.90 is: 486.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    545.10 : 815.58 = 324.90 : x
  2. Step 2: Convert to fraction form
    545.10/815.58 = 324.90/x
  3. Step 3: Cross multiply
    545.10x = 815.58 × 324.90
  4. Step 4: Simplify right side
    545.10x = 264,981.94
  5. Step 5: Solve for x
    x = 264,981.94/545.10
  6. Step 6: Final answer
    x = 486.12

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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.