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Finding the Fourth Proportional to 619.45, 854.49 and 386.71

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Solution

The fourth proportional to 619.45, 854.49 and 386.71 is: 533.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    619.45 : 854.49 = 386.71 : x
  2. Step 2: Convert to fraction form
    619.45/854.49 = 386.71/x
  3. Step 3: Cross multiply
    619.45x = 854.49 × 386.71
  4. Step 4: Simplify right side
    619.45x = 330,439.83
  5. Step 5: Solve for x
    x = 330,439.83/619.45
  6. Step 6: Final answer
    x = 533.44

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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.