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Finding the Fourth Proportional to 486.74, 671.08 and 290.18

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Solution

The fourth proportional to 486.74, 671.08 and 290.18 is: 400.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.74 : 671.08 = 290.18 : x
  2. Step 2: Convert to fraction form
    486.74/671.08 = 290.18/x
  3. Step 3: Cross multiply
    486.74x = 671.08 × 290.18
  4. Step 4: Simplify right side
    486.74x = 194,733.99
  5. Step 5: Solve for x
    x = 194,733.99/486.74
  6. Step 6: Final answer
    x = 400.08

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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.