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Finding the Fourth Proportional to 486.30, 728.65 and 404.70

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Solution

The fourth proportional to 486.30, 728.65 and 404.70 is: 606.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.30 : 728.65 = 404.70 : x
  2. Step 2: Convert to fraction form
    486.30/728.65 = 404.70/x
  3. Step 3: Cross multiply
    486.30x = 728.65 × 404.70
  4. Step 4: Simplify right side
    486.30x = 294,884.66
  5. Step 5: Solve for x
    x = 294,884.66/486.30
  6. Step 6: Final answer
    x = 606.38

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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.