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Finding the Fourth Proportional to 486.74, 671.55 and 290.16

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Solution

The fourth proportional to 486.74, 671.55 and 290.16 is: 400.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.74 : 671.55 = 290.16 : x
  2. Step 2: Convert to fraction form
    486.74/671.55 = 290.16/x
  3. Step 3: Cross multiply
    486.74x = 671.55 × 290.16
  4. Step 4: Simplify right side
    486.74x = 194,856.95
  5. Step 5: Solve for x
    x = 194,856.95/486.74
  6. Step 6: Final answer
    x = 400.33

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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.