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Finding the Fourth Proportional to 38.99, 53.75 and 30.53

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Solution

The fourth proportional to 38.99, 53.75 and 30.53 is: 42.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    38.99 : 53.75 = 30.53 : x
  2. Step 2: Convert to fraction form
    38.99/53.75 = 30.53/x
  3. Step 3: Cross multiply
    38.99x = 53.75 × 30.53
  4. Step 4: Simplify right side
    38.99x = 1,640.99
  5. Step 5: Solve for x
    x = 1,640.99/38.99
  6. Step 6: Final answer
    x = 42.09

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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.