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Finding the Fourth Proportional to 105.58, 158.38 and 47.80

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Solution

The fourth proportional to 105.58, 158.38 and 47.80 is: 71.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    105.58 : 158.38 = 47.80 : x
  2. Step 2: Convert to fraction form
    105.58/158.38 = 47.80/x
  3. Step 3: Cross multiply
    105.58x = 158.38 × 47.80
  4. Step 4: Simplify right side
    105.58x = 7,570.56
  5. Step 5: Solve for x
    x = 7,570.56/105.58
  6. Step 6: Final answer
    x = 71.70

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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.