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Finding the Fourth Proportional to 92.88, 128.32 and 71.21

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Solution

The fourth proportional to 92.88, 128.32 and 71.21 is: 98.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.88 : 128.32 = 71.21 : x
  2. Step 2: Convert to fraction form
    92.88/128.32 = 71.21/x
  3. Step 3: Cross multiply
    92.88x = 128.32 × 71.21
  4. Step 4: Simplify right side
    92.88x = 9,137.81
  5. Step 5: Solve for x
    x = 9,137.81/92.88
  6. Step 6: Final answer
    x = 98.38

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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.