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Finding the Fourth Proportional to 38.87, 53.62 and 30.65

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Solution

The fourth proportional to 38.87, 53.62 and 30.65 is: 42.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    38.87 : 53.62 = 30.65 : x
  2. Step 2: Convert to fraction form
    38.87/53.62 = 30.65/x
  3. Step 3: Cross multiply
    38.87x = 53.62 × 30.65
  4. Step 4: Simplify right side
    38.87x = 1,643.11
  5. Step 5: Solve for x
    x = 1,643.11/38.87
  6. Step 6: Final answer
    x = 42.28

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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.