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Finding the Fourth Proportional to 100, 149.64 and 89.76

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Solution

The fourth proportional to 100, 149.64 and 89.76 is: 134.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    100 : 149.64 = 89.76 : x
  2. Step 2: Convert to fraction form
    100/149.64 = 89.76/x
  3. Step 3: Cross multiply
    100x = 149.64 × 89.76
  4. Step 4: Simplify right side
    100x = 13,431.69
  5. Step 5: Solve for x
    x = 13,431.69/100
  6. Step 6: Final answer
    x = 134.32

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.