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Finding the Fourth Proportional to 42.34, 58.45 and 28.55

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Solution

The fourth proportional to 42.34, 58.45 and 28.55 is: 39.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    42.34 : 58.45 = 28.55 : x
  2. Step 2: Convert to fraction form
    42.34/58.45 = 28.55/x
  3. Step 3: Cross multiply
    42.34x = 58.45 × 28.55
  4. Step 4: Simplify right side
    42.34x = 1,668.82
  5. Step 5: Solve for x
    x = 1,668.82/42.34
  6. Step 6: Final answer
    x = 39.42

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.