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Finding the Fourth Proportional to 93.81, 129.39 and 67.89

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Solution

The fourth proportional to 93.81, 129.39 and 67.89 is: 93.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.81 : 129.39 = 67.89 : x
  2. Step 2: Convert to fraction form
    93.81/129.39 = 67.89/x
  3. Step 3: Cross multiply
    93.81x = 129.39 × 67.89
  4. Step 4: Simplify right side
    93.81x = 8,784.29
  5. Step 5: Solve for x
    x = 8,784.29/93.81
  6. Step 6: Final answer
    x = 93.64

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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.