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Finding the Fourth Proportional to 97.79, 145.76 and 92.66

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Solution

The fourth proportional to 97.79, 145.76 and 92.66 is: 138.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    97.79 : 145.76 = 92.66 : x
  2. Step 2: Convert to fraction form
    97.79/145.76 = 92.66/x
  3. Step 3: Cross multiply
    97.79x = 145.76 × 92.66
  4. Step 4: Simplify right side
    97.79x = 13,504.93
  5. Step 5: Solve for x
    x = 13,504.93/97.79
  6. Step 6: Final answer
    x = 138.11

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.