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Finding the Fourth Proportional to 619.38, 854.46 and 386.46

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Solution

The fourth proportional to 619.38, 854.46 and 386.46 is: 533.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    619.38 : 854.46 = 386.46 : x
  2. Step 2: Convert to fraction form
    619.38/854.46 = 386.46/x
  3. Step 3: Cross multiply
    619.38x = 854.46 × 386.46
  4. Step 4: Simplify right side
    619.38x = 330,214.61
  5. Step 5: Solve for x
    x = 330,214.61/619.38
  6. Step 6: Final answer
    x = 533.14

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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.