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Finding the Fourth Proportional to 545.10, 752.21 and 321.08

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Solution

The fourth proportional to 545.10, 752.21 and 321.08 is: 443.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    545.10 : 752.21 = 321.08 : x
  2. Step 2: Convert to fraction form
    545.10/752.21 = 321.08/x
  3. Step 3: Cross multiply
    545.10x = 752.21 × 321.08
  4. Step 4: Simplify right side
    545.10x = 241,519.59
  5. Step 5: Solve for x
    x = 241,519.59/545.10
  6. Step 6: Final answer
    x = 443.07

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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.