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Finding the Fourth Proportional to 42.93, 59.20 and 28.38

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Solution

The fourth proportional to 42.93, 59.20 and 28.38 is: 39.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    42.93 : 59.20 = 28.38 : x
  2. Step 2: Convert to fraction form
    42.93/59.20 = 28.38/x
  3. Step 3: Cross multiply
    42.93x = 59.20 × 28.38
  4. Step 4: Simplify right side
    42.93x = 1,680.10
  5. Step 5: Solve for x
    x = 1,680.10/42.93
  6. Step 6: Final answer
    x = 39.14

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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.