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Finding the Fourth Proportional to 93.28, 128.72 and 54.48

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Solution

The fourth proportional to 93.28, 128.72 and 54.48 is: 75.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.28 : 128.72 = 54.48 : x
  2. Step 2: Convert to fraction form
    93.28/128.72 = 54.48/x
  3. Step 3: Cross multiply
    93.28x = 128.72 × 54.48
  4. Step 4: Simplify right side
    93.28x = 7,012.67
  5. Step 5: Solve for x
    x = 7,012.67/93.28
  6. Step 6: Final answer
    x = 75.18

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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.