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Finding the Fourth Proportional to 258.26, 387.36 and 112.10

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Solution

The fourth proportional to 258.26, 387.36 and 112.10 is: 168.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.26 : 387.36 = 112.10 : x
  2. Step 2: Convert to fraction form
    258.26/387.36 = 112.10/x
  3. Step 3: Cross multiply
    258.26x = 387.36 × 112.10
  4. Step 4: Simplify right side
    258.26x = 43,421.12
  5. Step 5: Solve for x
    x = 43,421.12/258.26
  6. Step 6: Final answer
    x = 168.13

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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.