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Finding the Fourth Proportional to 260.60, 390.20 and 191.34

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Solution

The fourth proportional to 260.60, 390.20 and 191.34 is: 286.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    260.60 : 390.20 = 191.34 : x
  2. Step 2: Convert to fraction form
    260.60/390.20 = 191.34/x
  3. Step 3: Cross multiply
    260.60x = 390.20 × 191.34
  4. Step 4: Simplify right side
    260.60x = 74,659.91
  5. Step 5: Solve for x
    x = 74,659.91/260.60
  6. Step 6: Final answer
    x = 286.50

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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.