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Finding the Fourth Proportional to 93.03, 128.92 and 91.72

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Solution

The fourth proportional to 93.03, 128.92 and 91.72 is: 127.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.03 : 128.92 = 91.72 : x
  2. Step 2: Convert to fraction form
    93.03/128.92 = 91.72/x
  3. Step 3: Cross multiply
    93.03x = 128.92 × 91.72
  4. Step 4: Simplify right side
    93.03x = 11,824.31
  5. Step 5: Solve for x
    x = 11,824.31/93.03
  6. Step 6: Final answer
    x = 127.11

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.