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Finding the Fourth Proportional to 486.95, 672 and 287.79

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Solution

The fourth proportional to 486.95, 672 and 287.79 is: 397.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.95 : 672 = 287.79 : x
  2. Step 2: Convert to fraction form
    486.95/672 = 287.79/x
  3. Step 3: Cross multiply
    486.95x = 672 × 287.79
  4. Step 4: Simplify right side
    486.95x = 193,394.88
  5. Step 5: Solve for x
    x = 193,394.88/486.95
  6. Step 6: Final answer
    x = 397.16

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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.