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Finding the Fourth Proportional to 486.60, 669.96 and 412.80

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Solution

The fourth proportional to 486.60, 669.96 and 412.80 is: 568.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.60 : 669.96 = 412.80 : x
  2. Step 2: Convert to fraction form
    486.60/669.96 = 412.80/x
  3. Step 3: Cross multiply
    486.60x = 669.96 × 412.80
  4. Step 4: Simplify right side
    486.60x = 276,559.49
  5. Step 5: Solve for x
    x = 276,559.49/486.60
  6. Step 6: Final answer
    x = 568.35

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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.