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Finding the Fourth Proportional to 93.99, 129.48 and 80.83

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Solution

The fourth proportional to 93.99, 129.48 and 80.83 is: 111.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.99 : 129.48 = 80.83 : x
  2. Step 2: Convert to fraction form
    93.99/129.48 = 80.83/x
  3. Step 3: Cross multiply
    93.99x = 129.48 × 80.83
  4. Step 4: Simplify right side
    93.99x = 10,465.87
  5. Step 5: Solve for x
    x = 10,465.87/93.99
  6. Step 6: Final answer
    x = 111.35

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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.