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Finding the Fourth Proportional to 340.81, 470.16 and 221.35

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Solution

The fourth proportional to 340.81, 470.16 and 221.35 is: 305.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    340.81 : 470.16 = 221.35 : x
  2. Step 2: Convert to fraction form
    340.81/470.16 = 221.35/x
  3. Step 3: Cross multiply
    340.81x = 470.16 × 221.35
  4. Step 4: Simplify right side
    340.81x = 104,069.63
  5. Step 5: Solve for x
    x = 104,069.63/340.81
  6. Step 6: Final answer
    x = 305.36

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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.