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Finding the Fourth Proportional to 446.13, 669.20 and 215.20

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Solution

The fourth proportional to 446.13, 669.20 and 215.20 is: 322.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    446.13 : 669.20 = 215.20 : x
  2. Step 2: Convert to fraction form
    446.13/669.20 = 215.20/x
  3. Step 3: Cross multiply
    446.13x = 669.20 × 215.20
  4. Step 4: Simplify right side
    446.13x = 144,011.84
  5. Step 5: Solve for x
    x = 144,011.84/446.13
  6. Step 6: Final answer
    x = 322.80

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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.