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Finding the Fourth Proportional to 446.76, 669.36 and 261.40

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Solution

The fourth proportional to 446.76, 669.36 and 261.40 is: 391.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    446.76 : 669.36 = 261.40 : x
  2. Step 2: Convert to fraction form
    446.76/669.36 = 261.40/x
  3. Step 3: Cross multiply
    446.76x = 669.36 × 261.40
  4. Step 4: Simplify right side
    446.76x = 174,970.70
  5. Step 5: Solve for x
    x = 174,970.70/446.76
  6. Step 6: Final answer
    x = 391.64

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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.