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Finding the Fourth Proportional to 286.29, 429.08 and 123.80

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Solution

The fourth proportional to 286.29, 429.08 and 123.80 is: 185.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    286.29 : 429.08 = 123.80 : x
  2. Step 2: Convert to fraction form
    286.29/429.08 = 123.80/x
  3. Step 3: Cross multiply
    286.29x = 429.08 × 123.80
  4. Step 4: Simplify right side
    286.29x = 53,117.34
  5. Step 5: Solve for x
    x = 53,117.34/286.29
  6. Step 6: Final answer
    x = 185.54

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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.