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Finding the Fourth Proportional to 260.48, 390.45 and 106.31

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Solution

The fourth proportional to 260.48, 390.45 and 106.31 is: 159.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    260.48 : 390.45 = 106.31 : x
  2. Step 2: Convert to fraction form
    260.48/390.45 = 106.31/x
  3. Step 3: Cross multiply
    260.48x = 390.45 × 106.31
  4. Step 4: Simplify right side
    260.48x = 41,510.11
  5. Step 5: Solve for x
    x = 41,510.11/260.48
  6. Step 6: Final answer
    x = 159.36

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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.