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Finding the Fourth Proportional to 621.02, 927.20 and 547.21

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Solution

The fourth proportional to 621.02, 927.20 and 547.21 is: 816.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.02 : 927.20 = 547.21 : x
  2. Step 2: Convert to fraction form
    621.02/927.20 = 547.21/x
  3. Step 3: Cross multiply
    621.02x = 927.20 × 547.21
  4. Step 4: Simplify right side
    621.02x = 507,367.35
  5. Step 5: Solve for x
    x = 507,367.35/621.02
  6. Step 6: Final answer
    x = 816.99

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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.