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Finding the Fourth Proportional to 39.30, 58.96 and 19.02

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Solution

The fourth proportional to 39.30, 58.96 and 19.02 is: 28.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    39.30 : 58.96 = 19.02 : x
  2. Step 2: Convert to fraction form
    39.30/58.96 = 19.02/x
  3. Step 3: Cross multiply
    39.30x = 58.96 × 19.02
  4. Step 4: Simplify right side
    39.30x = 1,121.42
  5. Step 5: Solve for x
    x = 1,121.42/39.30
  6. Step 6: Final answer
    x = 28.53

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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.