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Finding the Fourth Proportional to 621.84, 932.78 and 210.99

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Solution

The fourth proportional to 621.84, 932.78 and 210.99 is: 316.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.84 : 932.78 = 210.99 : x
  2. Step 2: Convert to fraction form
    621.84/932.78 = 210.99/x
  3. Step 3: Cross multiply
    621.84x = 932.78 × 210.99
  4. Step 4: Simplify right side
    621.84x = 196,807.25
  5. Step 5: Solve for x
    x = 196,807.25/621.84
  6. Step 6: Final answer
    x = 316.49

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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.