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Finding the Fourth Proportional to 621.36, 939.42 and 621.36

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Solution

The fourth proportional to 621.36, 939.42 and 621.36 is: 939.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.36 : 939.42 = 621.36 : x
  2. Step 2: Convert to fraction form
    621.36/939.42 = 621.36/x
  3. Step 3: Cross multiply
    621.36x = 939.42 × 621.36
  4. Step 4: Simplify right side
    621.36x = 583,718.01
  5. Step 5: Solve for x
    x = 583,718.01/621.36
  6. Step 6: Final answer
    x = 939.42

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.