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Finding the Fourth Proportional to 486.64, 671.72 and 321

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Solution

The fourth proportional to 486.64, 671.72 and 321 is: 443.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.64 : 671.72 = 321 : x
  2. Step 2: Convert to fraction form
    486.64/671.72 = 321/x
  3. Step 3: Cross multiply
    486.64x = 671.72 × 321
  4. Step 4: Simplify right side
    486.64x = 215,622.12
  5. Step 5: Solve for x
    x = 215,622.12/486.64
  6. Step 6: Final answer
    x = 443.08

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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.