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Finding the Fourth Proportional to 93.40, 128.91 and 72.76

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Solution

The fourth proportional to 93.40, 128.91 and 72.76 is: 100.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.40 : 128.91 = 72.76 : x
  2. Step 2: Convert to fraction form
    93.40/128.91 = 72.76/x
  3. Step 3: Cross multiply
    93.40x = 128.91 × 72.76
  4. Step 4: Simplify right side
    93.40x = 9,379.49
  5. Step 5: Solve for x
    x = 9,379.49/93.40
  6. Step 6: Final answer
    x = 100.42

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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.