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Finding the Fourth Proportional to 295.20, 442.42 and 258.55

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Solution

The fourth proportional to 295.20, 442.42 and 258.55 is: 387.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    295.20 : 442.42 = 258.55 : x
  2. Step 2: Convert to fraction form
    295.20/442.42 = 258.55/x
  3. Step 3: Cross multiply
    295.20x = 442.42 × 258.55
  4. Step 4: Simplify right side
    295.20x = 114,387.69
  5. Step 5: Solve for x
    x = 114,387.69/295.20
  6. Step 6: Final answer
    x = 387.49

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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.