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Finding the Fourth Proportional to 619, 928.14 and 207.91

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Solution

The fourth proportional to 619, 928.14 and 207.91 is: 311.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    619 : 928.14 = 207.91 : x
  2. Step 2: Convert to fraction form
    619/928.14 = 207.91/x
  3. Step 3: Cross multiply
    619x = 928.14 × 207.91
  4. Step 4: Simplify right side
    619x = 192,969.59
  5. Step 5: Solve for x
    x = 192,969.59/619
  6. Step 6: Final answer
    x = 311.74

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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.