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Finding the Fourth Proportional to 53.09, 79.64 and 49.92

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Solution

The fourth proportional to 53.09, 79.64 and 49.92 is: 74.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    53.09 : 79.64 = 49.92 : x
  2. Step 2: Convert to fraction form
    53.09/79.64 = 49.92/x
  3. Step 3: Cross multiply
    53.09x = 79.64 × 49.92
  4. Step 4: Simplify right side
    53.09x = 3,975.38
  5. Step 5: Solve for x
    x = 3,975.38/53.09
  6. Step 6: Final answer
    x = 74.88

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.