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Finding the Fourth Proportional to 92.98, 127.53 and 87.72

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Solution

The fourth proportional to 92.98, 127.53 and 87.72 is: 120.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.98 : 127.53 = 87.72 : x
  2. Step 2: Convert to fraction form
    92.98/127.53 = 87.72/x
  3. Step 3: Cross multiply
    92.98x = 127.53 × 87.72
  4. Step 4: Simplify right side
    92.98x = 11,186.93
  5. Step 5: Solve for x
    x = 11,186.93/92.98
  6. Step 6: Final answer
    x = 120.32

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.