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Finding the Fourth Proportional to 93.94, 129.60 and 57.08

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Solution

The fourth proportional to 93.94, 129.60 and 57.08 is: 78.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.94 : 129.60 = 57.08 : x
  2. Step 2: Convert to fraction form
    93.94/129.60 = 57.08/x
  3. Step 3: Cross multiply
    93.94x = 129.60 × 57.08
  4. Step 4: Simplify right side
    93.94x = 7,397.57
  5. Step 5: Solve for x
    x = 7,397.57/93.94
  6. Step 6: Final answer
    x = 78.75

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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.