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Finding the Fourth Proportional to 446.40, 669.56 and 121.72

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Solution

The fourth proportional to 446.40, 669.56 and 121.72 is: 182.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    446.40 : 669.56 = 121.72 : x
  2. Step 2: Convert to fraction form
    446.40/669.56 = 121.72/x
  3. Step 3: Cross multiply
    446.40x = 669.56 × 121.72
  4. Step 4: Simplify right side
    446.40x = 81,498.84
  5. Step 5: Solve for x
    x = 81,498.84/446.40
  6. Step 6: Final answer
    x = 182.57

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.