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Finding the Fourth Proportional to 258.60, 387.06 and 190.11

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Solution

The fourth proportional to 258.60, 387.06 and 190.11 is: 284.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.60 : 387.06 = 190.11 : x
  2. Step 2: Convert to fraction form
    258.60/387.06 = 190.11/x
  3. Step 3: Cross multiply
    258.60x = 387.06 × 190.11
  4. Step 4: Simplify right side
    258.60x = 73,583.98
  5. Step 5: Solve for x
    x = 73,583.98/258.60
  6. Step 6: Final answer
    x = 284.55

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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.