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Finding the Fourth Proportional to 93.55, 140.88 and 85.51

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Solution

The fourth proportional to 93.55, 140.88 and 85.51 is: 128.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.55 : 140.88 = 85.51 : x
  2. Step 2: Convert to fraction form
    93.55/140.88 = 85.51/x
  3. Step 3: Cross multiply
    93.55x = 140.88 × 85.51
  4. Step 4: Simplify right side
    93.55x = 12,046.65
  5. Step 5: Solve for x
    x = 12,046.65/93.55
  6. Step 6: Final answer
    x = 128.77

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.