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Finding the Fourth Proportional to 93.83, 129.40 and 78.24

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Solution

The fourth proportional to 93.83, 129.40 and 78.24 is: 107.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.83 : 129.40 = 78.24 : x
  2. Step 2: Convert to fraction form
    93.83/129.40 = 78.24/x
  3. Step 3: Cross multiply
    93.83x = 129.40 × 78.24
  4. Step 4: Simplify right side
    93.83x = 10,124.06
  5. Step 5: Solve for x
    x = 10,124.06/93.83
  6. Step 6: Final answer
    x = 107.90

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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.