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Finding the Fourth Proportional to 103.64, 154.47 and 97.76

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Solution

The fourth proportional to 103.64, 154.47 and 97.76 is: 145.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.64 : 154.47 = 97.76 : x
  2. Step 2: Convert to fraction form
    103.64/154.47 = 97.76/x
  3. Step 3: Cross multiply
    103.64x = 154.47 × 97.76
  4. Step 4: Simplify right side
    103.64x = 15,100.21
  5. Step 5: Solve for x
    x = 15,100.21/103.64
  6. Step 6: Final answer
    x = 145.71

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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.