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Finding the Fourth Proportional to 486.19, 670.68 and 308.83

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Solution

The fourth proportional to 486.19, 670.68 and 308.83 is: 426.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.19 : 670.68 = 308.83 : x
  2. Step 2: Convert to fraction form
    486.19/670.68 = 308.83/x
  3. Step 3: Cross multiply
    486.19x = 670.68 × 308.83
  4. Step 4: Simplify right side
    486.19x = 207,126.10
  5. Step 5: Solve for x
    x = 207,126.10/486.19
  6. Step 6: Final answer
    x = 426.02

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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.