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Finding the Fourth Proportional to 619.70, 928.88 and 254.39

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Solution

The fourth proportional to 619.70, 928.88 and 254.39 is: 381.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    619.70 : 928.88 = 254.39 : x
  2. Step 2: Convert to fraction form
    619.70/928.88 = 254.39/x
  3. Step 3: Cross multiply
    619.70x = 928.88 × 254.39
  4. Step 4: Simplify right side
    619.70x = 236,296.51
  5. Step 5: Solve for x
    x = 236,296.51/619.70
  6. Step 6: Final answer
    x = 381.31

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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.