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Finding the Fourth Proportional to 94, 129.72 and 55.21

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Solution

The fourth proportional to 94, 129.72 and 55.21 is: 76.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    94 : 129.72 = 55.21 : x
  2. Step 2: Convert to fraction form
    94/129.72 = 55.21/x
  3. Step 3: Cross multiply
    94x = 129.72 × 55.21
  4. Step 4: Simplify right side
    94x = 7,161.84
  5. Step 5: Solve for x
    x = 7,161.84/94
  6. Step 6: Final answer
    x = 76.19

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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.