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Finding the Fourth Proportional to 486.90, 672 and 290.46

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Solution

The fourth proportional to 486.90, 672 and 290.46 is: 400.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.90 : 672 = 290.46 : x
  2. Step 2: Convert to fraction form
    486.90/672 = 290.46/x
  3. Step 3: Cross multiply
    486.90x = 672 × 290.46
  4. Step 4: Simplify right side
    486.90x = 195,189.12
  5. Step 5: Solve for x
    x = 195,189.12/486.90
  6. Step 6: Final answer
    x = 400.88

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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.