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Finding the Fourth Proportional to 93.40, 128.94 and 68.86

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Solution

The fourth proportional to 93.40, 128.94 and 68.86 is: 95.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.40 : 128.94 = 68.86 : x
  2. Step 2: Convert to fraction form
    93.40/128.94 = 68.86/x
  3. Step 3: Cross multiply
    93.40x = 128.94 × 68.86
  4. Step 4: Simplify right side
    93.40x = 8,878.81
  5. Step 5: Solve for x
    x = 8,878.81/93.40
  6. Step 6: Final answer
    x = 95.06

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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.