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Finding the Fourth Proportional to 638.16, 879.48 and 619.44

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Solution

The fourth proportional to 638.16, 879.48 and 619.44 is: 853.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    638.16 : 879.48 = 619.44 : x
  2. Step 2: Convert to fraction form
    638.16/879.48 = 619.44/x
  3. Step 3: Cross multiply
    638.16x = 879.48 × 619.44
  4. Step 4: Simplify right side
    638.16x = 544,785.09
  5. Step 5: Solve for x
    x = 544,785.09/638.16
  6. Step 6: Final answer
    x = 853.68

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.