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Finding the Fourth Proportional to 486.99, 671.90 and 277.15

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Solution

The fourth proportional to 486.99, 671.90 and 277.15 is: 382.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.99 : 671.90 = 277.15 : x
  2. Step 2: Convert to fraction form
    486.99/671.90 = 277.15/x
  3. Step 3: Cross multiply
    486.99x = 671.90 × 277.15
  4. Step 4: Simplify right side
    486.99x = 186,215.70
  5. Step 5: Solve for x
    x = 186,215.70/486.99
  6. Step 6: Final answer
    x = 382.38

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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.