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Finding the Fourth Proportional to 412.31, 617.78 and 290.36

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Solution

The fourth proportional to 412.31, 617.78 and 290.36 is: 435.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    412.31 : 617.78 = 290.36 : x
  2. Step 2: Convert to fraction form
    412.31/617.78 = 290.36/x
  3. Step 3: Cross multiply
    412.31x = 617.78 × 290.36
  4. Step 4: Simplify right side
    412.31x = 179,374.06
  5. Step 5: Solve for x
    x = 179,374.06/412.31
  6. Step 6: Final answer
    x = 435.05

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.