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Finding the Fourth Proportional to 486.64, 671.27 and 320.79

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Solution

The fourth proportional to 486.64, 671.27 and 320.79 is: 442.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.64 : 671.27 = 320.79 : x
  2. Step 2: Convert to fraction form
    486.64/671.27 = 320.79/x
  3. Step 3: Cross multiply
    486.64x = 671.27 × 320.79
  4. Step 4: Simplify right side
    486.64x = 215,336.70
  5. Step 5: Solve for x
    x = 215,336.70/486.64
  6. Step 6: Final answer
    x = 442.50

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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.