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Finding the Fourth Proportional to 187.94, 281.98 and 79.70

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Solution

The fourth proportional to 187.94, 281.98 and 79.70 is: 119.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    187.94 : 281.98 = 79.70 : x
  2. Step 2: Convert to fraction form
    187.94/281.98 = 79.70/x
  3. Step 3: Cross multiply
    187.94x = 281.98 × 79.70
  4. Step 4: Simplify right side
    187.94x = 22,473.81
  5. Step 5: Solve for x
    x = 22,473.81/187.94
  6. Step 6: Final answer
    x = 119.58

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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.