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Finding the Fourth Proportional to 545.28, 817.20 and 423.36

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Solution

The fourth proportional to 545.28, 817.20 and 423.36 is: 634.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    545.28 : 817.20 = 423.36 : x
  2. Step 2: Convert to fraction form
    545.28/817.20 = 423.36/x
  3. Step 3: Cross multiply
    545.28x = 817.20 × 423.36
  4. Step 4: Simplify right side
    545.28x = 345,969.79
  5. Step 5: Solve for x
    x = 345,969.79/545.28
  6. Step 6: Final answer
    x = 634.48

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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.