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Finding the Fourth Proportional to 616.79, 921.12 and 548.75

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Solution

The fourth proportional to 616.79, 921.12 and 548.75 is: 819.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    616.79 : 921.12 = 548.75 : x
  2. Step 2: Convert to fraction form
    616.79/921.12 = 548.75/x
  3. Step 3: Cross multiply
    616.79x = 921.12 × 548.75
  4. Step 4: Simplify right side
    616.79x = 505,464.60
  5. Step 5: Solve for x
    x = 505,464.60/616.79
  6. Step 6: Final answer
    x = 819.51

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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.