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Finding the Fourth Proportional to 92.76, 128.03 and 53.96

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Solution

The fourth proportional to 92.76, 128.03 and 53.96 is: 74.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.76 : 128.03 = 53.96 : x
  2. Step 2: Convert to fraction form
    92.76/128.03 = 53.96/x
  3. Step 3: Cross multiply
    92.76x = 128.03 × 53.96
  4. Step 4: Simplify right side
    92.76x = 6,907.59
  5. Step 5: Solve for x
    x = 6,907.59/92.76
  6. Step 6: Final answer
    x = 74.47

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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.