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Finding the Fourth Proportional to 95.79, 142.79 and 90.66

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Solution

The fourth proportional to 95.79, 142.79 and 90.66 is: 135.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    95.79 : 142.79 = 90.66 : x
  2. Step 2: Convert to fraction form
    95.79/142.79 = 90.66/x
  3. Step 3: Cross multiply
    95.79x = 142.79 × 90.66
  4. Step 4: Simplify right side
    95.79x = 12,945.34
  5. Step 5: Solve for x
    x = 12,945.34/95.79
  6. Step 6: Final answer
    x = 135.14

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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.