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Finding the Fourth Proportional to 555.91, 768.63 and 486.70

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Solution

The fourth proportional to 555.91, 768.63 and 486.70 is: 672.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    555.91 : 768.63 = 486.70 : x
  2. Step 2: Convert to fraction form
    555.91/768.63 = 486.70/x
  3. Step 3: Cross multiply
    555.91x = 768.63 × 486.70
  4. Step 4: Simplify right side
    555.91x = 374,092.22
  5. Step 5: Solve for x
    x = 374,092.22/555.91
  6. Step 6: Final answer
    x = 672.94

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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.