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Finding the Fourth Proportional to 820.66, 1,230.95 and 204.35

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Solution

The fourth proportional to 820.66, 1,230.95 and 204.35 is: 306.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    820.66 : 1,230.95 = 204.35 : x
  2. Step 2: Convert to fraction form
    820.66/1,230.95 = 204.35/x
  3. Step 3: Cross multiply
    820.66x = 1,230.95 × 204.35
  4. Step 4: Simplify right side
    820.66x = 251,537.46
  5. Step 5: Solve for x
    x = 251,537.46/820.66
  6. Step 6: Final answer
    x = 306.51

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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.