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Finding the Fourth Proportional to 619.40, 854.77 and 339.64

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Solution

The fourth proportional to 619.40, 854.77 and 339.64 is: 468.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    619.40 : 854.77 = 339.64 : x
  2. Step 2: Convert to fraction form
    619.40/854.77 = 339.64/x
  3. Step 3: Cross multiply
    619.40x = 854.77 × 339.64
  4. Step 4: Simplify right side
    619.40x = 290,314.08
  5. Step 5: Solve for x
    x = 290,314.08/619.40
  6. Step 6: Final answer
    x = 468.70

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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.