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Finding the Fourth Proportional to 617.28, 921.41 and 539.43

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Solution

The fourth proportional to 617.28, 921.41 and 539.43 is: 805.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    617.28 : 921.41 = 539.43 : x
  2. Step 2: Convert to fraction form
    617.28/921.41 = 539.43/x
  3. Step 3: Cross multiply
    617.28x = 921.41 × 539.43
  4. Step 4: Simplify right side
    617.28x = 497,038.56
  5. Step 5: Solve for x
    x = 497,038.56/617.28
  6. Step 6: Final answer
    x = 805.21

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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.