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Finding the Fourth Proportional to 619.66, 855.12 and 339.90

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Solution

The fourth proportional to 619.66, 855.12 and 339.90 is: 469.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    619.66 : 855.12 = 339.90 : x
  2. Step 2: Convert to fraction form
    619.66/855.12 = 339.90/x
  3. Step 3: Cross multiply
    619.66x = 855.12 × 339.90
  4. Step 4: Simplify right side
    619.66x = 290,655.29
  5. Step 5: Solve for x
    x = 290,655.29/619.66
  6. Step 6: Final answer
    x = 469.06

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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.