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Finding the Fourth Proportional to 621.72, 932.39 and 210.78

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Solution

The fourth proportional to 621.72, 932.39 and 210.78 is: 316.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.72 : 932.39 = 210.78 : x
  2. Step 2: Convert to fraction form
    621.72/932.39 = 210.78/x
  3. Step 3: Cross multiply
    621.72x = 932.39 × 210.78
  4. Step 4: Simplify right side
    621.72x = 196,528.11
  5. Step 5: Solve for x
    x = 196,528.11/621.72
  6. Step 6: Final answer
    x = 316.10

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1.5x scale

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.