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Finding the Fourth Proportional to 258.23, 387.45 and 112.02

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Solution

The fourth proportional to 258.23, 387.45 and 112.02 is: 168.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.23 : 387.45 = 112.02 : x
  2. Step 2: Convert to fraction form
    258.23/387.45 = 112.02/x
  3. Step 3: Cross multiply
    258.23x = 387.45 × 112.02
  4. Step 4: Simplify right side
    258.23x = 43,402.15
  5. Step 5: Solve for x
    x = 43,402.15/258.23
  6. Step 6: Final answer
    x = 168.08

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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.