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Finding the Fourth Proportional to 129.28, 193.81 and 57.10

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Solution

The fourth proportional to 129.28, 193.81 and 57.10 is: 85.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.28 : 193.81 = 57.10 : x
  2. Step 2: Convert to fraction form
    129.28/193.81 = 57.10/x
  3. Step 3: Cross multiply
    129.28x = 193.81 × 57.10
  4. Step 4: Simplify right side
    129.28x = 11,066.55
  5. Step 5: Solve for x
    x = 11,066.55/129.28
  6. Step 6: Final answer
    x = 85.60

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.