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Finding the Fourth Proportional to 188.80, 283.28 and 86.16

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Solution

The fourth proportional to 188.80, 283.28 and 86.16 is: 129.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    188.80 : 283.28 = 86.16 : x
  2. Step 2: Convert to fraction form
    188.80/283.28 = 86.16/x
  3. Step 3: Cross multiply
    188.80x = 283.28 × 86.16
  4. Step 4: Simplify right side
    188.80x = 24,407.40
  5. Step 5: Solve for x
    x = 24,407.40/188.80
  6. Step 6: Final answer
    x = 129.28

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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.