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Finding the Fourth Proportional to 306.12, 421.98 and 259.32

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Solution

The fourth proportional to 306.12, 421.98 and 259.32 is: 357.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    306.12 : 421.98 = 259.32 : x
  2. Step 2: Convert to fraction form
    306.12/421.98 = 259.32/x
  3. Step 3: Cross multiply
    306.12x = 421.98 × 259.32
  4. Step 4: Simplify right side
    306.12x = 109,427.85
  5. Step 5: Solve for x
    x = 109,427.85/306.12
  6. Step 6: Final answer
    x = 357.47

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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.