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Finding the Fourth Proportional to 188.81, 283.05 and 86.04

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Solution

The fourth proportional to 188.81, 283.05 and 86.04 is: 128.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    188.81 : 283.05 = 86.04 : x
  2. Step 2: Convert to fraction form
    188.81/283.05 = 86.04/x
  3. Step 3: Cross multiply
    188.81x = 283.05 × 86.04
  4. Step 4: Simplify right side
    188.81x = 24,353.62
  5. Step 5: Solve for x
    x = 24,353.62/188.81
  6. Step 6: Final answer
    x = 128.98

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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.