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Finding the Fourth Proportional to 486.96, 671.99 and 290.58

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Solution

The fourth proportional to 486.96, 671.99 and 290.58 is: 400.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.96 : 671.99 = 290.58 : x
  2. Step 2: Convert to fraction form
    486.96/671.99 = 290.58/x
  3. Step 3: Cross multiply
    486.96x = 671.99 × 290.58
  4. Step 4: Simplify right side
    486.96x = 195,265.40
  5. Step 5: Solve for x
    x = 195,265.40/486.96
  6. Step 6: Final answer
    x = 400.99

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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.