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Finding the Fourth Proportional to 210.78, 316.50 and 200.49

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Solution

The fourth proportional to 210.78, 316.50 and 200.49 is: 301.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    210.78 : 316.50 = 200.49 : x
  2. Step 2: Convert to fraction form
    210.78/316.50 = 200.49/x
  3. Step 3: Cross multiply
    210.78x = 316.50 × 200.49
  4. Step 4: Simplify right side
    210.78x = 63,455.09
  5. Step 5: Solve for x
    x = 63,455.09/210.78
  6. Step 6: Final answer
    x = 301.05

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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.