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Finding the Fourth Proportional to 39.04, 53.85 and 30.30

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Solution

The fourth proportional to 39.04, 53.85 and 30.30 is: 41.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    39.04 : 53.85 = 30.30 : x
  2. Step 2: Convert to fraction form
    39.04/53.85 = 30.30/x
  3. Step 3: Cross multiply
    39.04x = 53.85 × 30.30
  4. Step 4: Simplify right side
    39.04x = 1,631.70
  5. Step 5: Solve for x
    x = 1,631.70/39.04
  6. Step 6: Final answer
    x = 41.79

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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.