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Finding the Fourth Proportional to 55.71, 76.86 and 33.57

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Solution

The fourth proportional to 55.71, 76.86 and 33.57 is: 46.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    55.71 : 76.86 = 33.57 : x
  2. Step 2: Convert to fraction form
    55.71/76.86 = 33.57/x
  3. Step 3: Cross multiply
    55.71x = 76.86 × 33.57
  4. Step 4: Simplify right side
    55.71x = 2,580.19
  5. Step 5: Solve for x
    x = 2,580.19/55.71
  6. Step 6: Final answer
    x = 46.31

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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.