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Finding the Fourth Proportional to 613.20, 916.26 and 548.40

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Solution

The fourth proportional to 613.20, 916.26 and 548.40 is: 819.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    613.20 : 916.26 = 548.40 : x
  2. Step 2: Convert to fraction form
    613.20/916.26 = 548.40/x
  3. Step 3: Cross multiply
    613.20x = 916.26 × 548.40
  4. Step 4: Simplify right side
    613.20x = 502,476.98
  5. Step 5: Solve for x
    x = 502,476.98/613.20
  6. Step 6: Final answer
    x = 819.43

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.