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Finding the Fourth Proportional to 621.23, 931.92 and 210.28

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Solution

The fourth proportional to 621.23, 931.92 and 210.28 is: 315.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.23 : 931.92 = 210.28 : x
  2. Step 2: Convert to fraction form
    621.23/931.92 = 210.28/x
  3. Step 3: Cross multiply
    621.23x = 931.92 × 210.28
  4. Step 4: Simplify right side
    621.23x = 195,964.14
  5. Step 5: Solve for x
    x = 195,964.14/621.23
  6. Step 6: Final answer
    x = 315.45

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.