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Finding the Fourth Proportional to 286.80, 429.88 and 158.80

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Solution

The fourth proportional to 286.80, 429.88 and 158.80 is: 238.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    286.80 : 429.88 = 158.80 : x
  2. Step 2: Convert to fraction form
    286.80/429.88 = 158.80/x
  3. Step 3: Cross multiply
    286.80x = 429.88 × 158.80
  4. Step 4: Simplify right side
    286.80x = 68,264.94
  5. Step 5: Solve for x
    x = 68,264.94/286.80
  6. Step 6: Final answer
    x = 238.02

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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.