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Finding the Fourth Proportional to 93.10, 128.36 and 88.20

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Solution

The fourth proportional to 93.10, 128.36 and 88.20 is: 121.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.10 : 128.36 = 88.20 : x
  2. Step 2: Convert to fraction form
    93.10/128.36 = 88.20/x
  3. Step 3: Cross multiply
    93.10x = 128.36 × 88.20
  4. Step 4: Simplify right side
    93.10x = 11,321.35
  5. Step 5: Solve for x
    x = 11,321.35/93.10
  6. Step 6: Final answer
    x = 121.60

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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.