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Finding the Fourth Proportional to 619.90, 855.82 and 383.94

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Solution

The fourth proportional to 619.90, 855.82 and 383.94 is: 530.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    619.90 : 855.82 = 383.94 : x
  2. Step 2: Convert to fraction form
    619.90/855.82 = 383.94/x
  3. Step 3: Cross multiply
    619.90x = 855.82 × 383.94
  4. Step 4: Simplify right side
    619.90x = 328,581.85
  5. Step 5: Solve for x
    x = 328,581.85/619.90
  6. Step 6: Final answer
    x = 530.05

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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.