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Finding the Fourth Proportional to 619.36, 928.88 and 208.49

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Solution

The fourth proportional to 619.36, 928.88 and 208.49 is: 312.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    619.36 : 928.88 = 208.49 : x
  2. Step 2: Convert to fraction form
    619.36/928.88 = 208.49/x
  3. Step 3: Cross multiply
    619.36x = 928.88 × 208.49
  4. Step 4: Simplify right side
    619.36x = 193,658.46
  5. Step 5: Solve for x
    x = 193,658.46/619.36
  6. Step 6: Final answer
    x = 312.68

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Similar ratio
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1.5x scale

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.