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Finding the Fourth Proportional to 545.40, 819.09 and 314.91

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Solution

The fourth proportional to 545.40, 819.09 and 314.91 is: 472.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    545.40 : 819.09 = 314.91 : x
  2. Step 2: Convert to fraction form
    545.40/819.09 = 314.91/x
  3. Step 3: Cross multiply
    545.40x = 819.09 × 314.91
  4. Step 4: Simplify right side
    545.40x = 257,939.63
  5. Step 5: Solve for x
    x = 257,939.63/545.40
  6. Step 6: Final answer
    x = 472.94

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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.