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Finding the Fourth Proportional to 619.84, 855.48 and 387.04

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Solution

The fourth proportional to 619.84, 855.48 and 387.04 is: 534.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    619.84 : 855.48 = 387.04 : x
  2. Step 2: Convert to fraction form
    619.84/855.48 = 387.04/x
  3. Step 3: Cross multiply
    619.84x = 855.48 × 387.04
  4. Step 4: Simplify right side
    619.84x = 331,104.98
  5. Step 5: Solve for x
    x = 331,104.98/619.84
  6. Step 6: Final answer
    x = 534.18

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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.