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Finding the Fourth Proportional to 92.42, 128.16 and 89.35

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Solution

The fourth proportional to 92.42, 128.16 and 89.35 is: 123.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.42 : 128.16 = 89.35 : x
  2. Step 2: Convert to fraction form
    92.42/128.16 = 89.35/x
  3. Step 3: Cross multiply
    92.42x = 128.16 × 89.35
  4. Step 4: Simplify right side
    92.42x = 11,450.01
  5. Step 5: Solve for x
    x = 11,450.01/92.42
  6. Step 6: Final answer
    x = 123.89

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.