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Finding the Fourth Proportional to 93.62, 128.99 and 86.13

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Solution

The fourth proportional to 93.62, 128.99 and 86.13 is: 118.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.62 : 128.99 = 86.13 : x
  2. Step 2: Convert to fraction form
    93.62/128.99 = 86.13/x
  3. Step 3: Cross multiply
    93.62x = 128.99 × 86.13
  4. Step 4: Simplify right side
    93.62x = 11,110.12
  5. Step 5: Solve for x
    x = 11,110.12/93.62
  6. Step 6: Final answer
    x = 118.67

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.