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Finding the Fourth Proportional to 53.09, 73.28 and 49.87

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Solution

The fourth proportional to 53.09, 73.28 and 49.87 is: 68.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    53.09 : 73.28 = 49.87 : x
  2. Step 2: Convert to fraction form
    53.09/73.28 = 49.87/x
  3. Step 3: Cross multiply
    53.09x = 73.28 × 49.87
  4. Step 4: Simplify right side
    53.09x = 3,654.51
  5. Step 5: Solve for x
    x = 3,654.51/53.09
  6. Step 6: Final answer
    x = 68.83

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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.