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Finding the Fourth Proportional to 258.55, 387.69 and 104.47

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Solution

The fourth proportional to 258.55, 387.69 and 104.47 is: 156.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.55 : 387.69 = 104.47 : x
  2. Step 2: Convert to fraction form
    258.55/387.69 = 104.47/x
  3. Step 3: Cross multiply
    258.55x = 387.69 × 104.47
  4. Step 4: Simplify right side
    258.55x = 40,501.97
  5. Step 5: Solve for x
    x = 40,501.97/258.55
  6. Step 6: Final answer
    x = 156.65

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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.