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Finding the Fourth Proportional to 93.20, 128.62 and 56.38

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Solution

The fourth proportional to 93.20, 128.62 and 56.38 is: 77.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.20 : 128.62 = 56.38 : x
  2. Step 2: Convert to fraction form
    93.20/128.62 = 56.38/x
  3. Step 3: Cross multiply
    93.20x = 128.62 × 56.38
  4. Step 4: Simplify right side
    93.20x = 7,251.22
  5. Step 5: Solve for x
    x = 7,251.22/93.20
  6. Step 6: Final answer
    x = 77.81

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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.