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Finding the Fourth Proportional to 306.12, 422.30 and 188.00

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Solution

The fourth proportional to 306.12, 422.30 and 188.00 is: 259.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    306.12 : 422.30 = 188.00 : x
  2. Step 2: Convert to fraction form
    306.12/422.30 = 188.00/x
  3. Step 3: Cross multiply
    306.12x = 422.30 × 188.00
  4. Step 4: Simplify right side
    306.12x = 79,389.35
  5. Step 5: Solve for x
    x = 79,389.35/306.12
  6. Step 6: Final answer
    x = 259.34

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.