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Finding the Fourth Proportional to 260.71, 390.78 and 106.57

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Solution

The fourth proportional to 260.71, 390.78 and 106.57 is: 159.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    260.71 : 390.78 = 106.57 : x
  2. Step 2: Convert to fraction form
    260.71/390.78 = 106.57/x
  3. Step 3: Cross multiply
    260.71x = 390.78 × 106.57
  4. Step 4: Simplify right side
    260.71x = 41,645.42
  5. Step 5: Solve for x
    x = 41,645.42/260.71
  6. Step 6: Final answer
    x = 159.74

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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.