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Finding the Fourth Proportional to 545.38, 752.61 and 309.33

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Solution

The fourth proportional to 545.38, 752.61 and 309.33 is: 426.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    545.38 : 752.61 = 309.33 : x
  2. Step 2: Convert to fraction form
    545.38/752.61 = 309.33/x
  3. Step 3: Cross multiply
    545.38x = 752.61 × 309.33
  4. Step 4: Simplify right side
    545.38x = 232,806.01
  5. Step 5: Solve for x
    x = 232,806.01/545.38
  6. Step 6: Final answer
    x = 426.87

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.