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Finding the Fourth Proportional to 486.68, 671.39 and 290.15

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Solution

The fourth proportional to 486.68, 671.39 and 290.15 is: 400.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.68 : 671.39 = 290.15 : x
  2. Step 2: Convert to fraction form
    486.68/671.39 = 290.15/x
  3. Step 3: Cross multiply
    486.68x = 671.39 × 290.15
  4. Step 4: Simplify right side
    486.68x = 194,802.61
  5. Step 5: Solve for x
    x = 194,802.61/486.68
  6. Step 6: Final answer
    x = 400.27

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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.