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Finding the Fourth Proportional to 42.31, 58.41 and 28.50

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Solution

The fourth proportional to 42.31, 58.41 and 28.50 is: 39.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    42.31 : 58.41 = 28.50 : x
  2. Step 2: Convert to fraction form
    42.31/58.41 = 28.50/x
  3. Step 3: Cross multiply
    42.31x = 58.41 × 28.50
  4. Step 4: Simplify right side
    42.31x = 1,664.75
  5. Step 5: Solve for x
    x = 1,664.75/42.31
  6. Step 6: Final answer
    x = 39.35

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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.