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Finding the Fourth Proportional to 94.08, 129.78 and 70.86

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Solution

The fourth proportional to 94.08, 129.78 and 70.86 is: 97.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    94.08 : 129.78 = 70.86 : x
  2. Step 2: Convert to fraction form
    94.08/129.78 = 70.86/x
  3. Step 3: Cross multiply
    94.08x = 129.78 × 70.86
  4. Step 4: Simplify right side
    94.08x = 9,196.21
  5. Step 5: Solve for x
    x = 9,196.21/94.08
  6. Step 6: Final answer
    x = 97.75

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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.