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Finding the Fourth Proportional to 610.12, 915.21 and 199.09

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Solution

The fourth proportional to 610.12, 915.21 and 199.09 is: 298.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    610.12 : 915.21 = 199.09 : x
  2. Step 2: Convert to fraction form
    610.12/915.21 = 199.09/x
  3. Step 3: Cross multiply
    610.12x = 915.21 × 199.09
  4. Step 4: Simplify right side
    610.12x = 182,204.58
  5. Step 5: Solve for x
    x = 182,204.58/610.12
  6. Step 6: Final answer
    x = 298.64

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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.