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Finding the Fourth Proportional to 105.68, 158.43 and 47.12

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Solution

The fourth proportional to 105.68, 158.43 and 47.12 is: 70.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    105.68 : 158.43 = 47.12 : x
  2. Step 2: Convert to fraction form
    105.68/158.43 = 47.12/x
  3. Step 3: Cross multiply
    105.68x = 158.43 × 47.12
  4. Step 4: Simplify right side
    105.68x = 7,465.22
  5. Step 5: Solve for x
    x = 7,465.22/105.68
  6. Step 6: Final answer
    x = 70.64

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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.