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Finding the Fourth Proportional to 619.47, 854.86 and 339.70

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Solution

The fourth proportional to 619.47, 854.86 and 339.70 is: 468.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    619.47 : 854.86 = 339.70 : x
  2. Step 2: Convert to fraction form
    619.47/854.86 = 339.70/x
  3. Step 3: Cross multiply
    619.47x = 854.86 × 339.70
  4. Step 4: Simplify right side
    619.47x = 290,395.94
  5. Step 5: Solve for x
    x = 290,395.94/619.47
  6. Step 6: Final answer
    x = 468.78

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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.