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Finding the Fourth Proportional to 53.86, 74.32 and 30.55

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Solution

The fourth proportional to 53.86, 74.32 and 30.55 is: 42.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    53.86 : 74.32 = 30.55 : x
  2. Step 2: Convert to fraction form
    53.86/74.32 = 30.55/x
  3. Step 3: Cross multiply
    53.86x = 74.32 × 30.55
  4. Step 4: Simplify right side
    53.86x = 2,270.14
  5. Step 5: Solve for x
    x = 2,270.14/53.86
  6. Step 6: Final answer
    x = 42.15

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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.