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Finding the Fourth Proportional to 42.43, 58.54 and 28.63

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Solution

The fourth proportional to 42.43, 58.54 and 28.63 is: 39.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    42.43 : 58.54 = 28.63 : x
  2. Step 2: Convert to fraction form
    42.43/58.54 = 28.63/x
  3. Step 3: Cross multiply
    42.43x = 58.54 × 28.63
  4. Step 4: Simplify right side
    42.43x = 1,676.00
  5. Step 5: Solve for x
    x = 1,676.00/42.43
  6. Step 6: Final answer
    x = 39.50

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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.