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Finding the Fourth Proportional to 53.87, 74.33 and 30.55

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Solution

The fourth proportional to 53.87, 74.33 and 30.55 is: 42.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    53.87 : 74.33 = 30.55 : x
  2. Step 2: Convert to fraction form
    53.87/74.33 = 30.55/x
  3. Step 3: Cross multiply
    53.87x = 74.33 × 30.55
  4. Step 4: Simplify right side
    53.87x = 2,270.78
  5. Step 5: Solve for x
    x = 2,270.78/53.87
  6. Step 6: Final answer
    x = 42.16

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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.