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Finding the Fourth Proportional to 93.79, 129.43 and 81.51

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Solution

The fourth proportional to 93.79, 129.43 and 81.51 is: 112.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.79 : 129.43 = 81.51 : x
  2. Step 2: Convert to fraction form
    93.79/129.43 = 81.51/x
  3. Step 3: Cross multiply
    93.79x = 129.43 × 81.51
  4. Step 4: Simplify right side
    93.79x = 10,549.84
  5. Step 5: Solve for x
    x = 10,549.84/93.79
  6. Step 6: Final answer
    x = 112.48

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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.