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Finding the Fourth Proportional to 545.07, 753.38 and 398.73

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Solution

The fourth proportional to 545.07, 753.38 and 398.73 is: 551.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    545.07 : 753.38 = 398.73 : x
  2. Step 2: Convert to fraction form
    545.07/753.38 = 398.73/x
  3. Step 3: Cross multiply
    545.07x = 753.38 × 398.73
  4. Step 4: Simplify right side
    545.07x = 300,395.21
  5. Step 5: Solve for x
    x = 300,395.21/545.07
  6. Step 6: Final answer
    x = 551.11

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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.