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Finding the Fourth Proportional to 545.46, 752.72 and 309.39

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Solution

The fourth proportional to 545.46, 752.72 and 309.39 is: 426.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    545.46 : 752.72 = 309.39 : x
  2. Step 2: Convert to fraction form
    545.46/752.72 = 309.39/x
  3. Step 3: Cross multiply
    545.46x = 752.72 × 309.39
  4. Step 4: Simplify right side
    545.46x = 232,884.04
  5. Step 5: Solve for x
    x = 232,884.04/545.46
  6. Step 6: Final answer
    x = 426.95

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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.