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Finding the Fourth Proportional to 93.03, 128.43 and 72.33

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Solution

The fourth proportional to 93.03, 128.43 and 72.33 is: 99.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.03 : 128.43 = 72.33 : x
  2. Step 2: Convert to fraction form
    93.03/128.43 = 72.33/x
  3. Step 3: Cross multiply
    93.03x = 128.43 × 72.33
  4. Step 4: Simplify right side
    93.03x = 9,289.34
  5. Step 5: Solve for x
    x = 9,289.34/93.03
  6. Step 6: Final answer
    x = 99.85

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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.