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Finding the Fourth Proportional to 96.42, 145.45 and 90.81

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Solution

The fourth proportional to 96.42, 145.45 and 90.81 is: 136.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    96.42 : 145.45 = 90.81 : x
  2. Step 2: Convert to fraction form
    96.42/145.45 = 90.81/x
  3. Step 3: Cross multiply
    96.42x = 145.45 × 90.81
  4. Step 4: Simplify right side
    96.42x = 13,207.92
  5. Step 5: Solve for x
    x = 13,207.92/96.42
  6. Step 6: Final answer
    x = 136.98

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.