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Finding the Fourth Proportional to 309.10, 425.64 and 221.62

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Solution

The fourth proportional to 309.10, 425.64 and 221.62 is: 305.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.10 : 425.64 = 221.62 : x
  2. Step 2: Convert to fraction form
    309.10/425.64 = 221.62/x
  3. Step 3: Cross multiply
    309.10x = 425.64 × 221.62
  4. Step 4: Simplify right side
    309.10x = 94,330.34
  5. Step 5: Solve for x
    x = 94,330.34/309.10
  6. Step 6: Final answer
    x = 305.18

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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.