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Finding the Fourth Proportional to 619.92, 855.72 and 383.91

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Solution

The fourth proportional to 619.92, 855.72 and 383.91 is: 529.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    619.92 : 855.72 = 383.91 : x
  2. Step 2: Convert to fraction form
    619.92/855.72 = 383.91/x
  3. Step 3: Cross multiply
    619.92x = 855.72 × 383.91
  4. Step 4: Simplify right side
    619.92x = 328,519.47
  5. Step 5: Solve for x
    x = 328,519.47/619.92
  6. Step 6: Final answer
    x = 529.94

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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.