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Finding the Fourth Proportional to 611.66, 843.08 and 486.74

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Solution

The fourth proportional to 611.66, 843.08 and 486.74 is: 670.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.66 : 843.08 = 486.74 : x
  2. Step 2: Convert to fraction form
    611.66/843.08 = 486.74/x
  3. Step 3: Cross multiply
    611.66x = 843.08 × 486.74
  4. Step 4: Simplify right side
    611.66x = 410,360.76
  5. Step 5: Solve for x
    x = 410,360.76/611.66
  6. Step 6: Final answer
    x = 670.90

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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.