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Finding the Fourth Proportional to 305.35, 421.47 and 250.22

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Solution

The fourth proportional to 305.35, 421.47 and 250.22 is: 345.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    305.35 : 421.47 = 250.22 : x
  2. Step 2: Convert to fraction form
    305.35/421.47 = 250.22/x
  3. Step 3: Cross multiply
    305.35x = 421.47 × 250.22
  4. Step 4: Simplify right side
    305.35x = 105,461.28
  5. Step 5: Solve for x
    x = 105,461.28/305.35
  6. Step 6: Final answer
    x = 345.38

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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.