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Finding the Fourth Proportional to 486.13, 670.85 and 279.17

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Solution

The fourth proportional to 486.13, 670.85 and 279.17 is: 385.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.13 : 670.85 = 279.17 : x
  2. Step 2: Convert to fraction form
    486.13/670.85 = 279.17/x
  3. Step 3: Cross multiply
    486.13x = 670.85 × 279.17
  4. Step 4: Simplify right side
    486.13x = 187,278.54
  5. Step 5: Solve for x
    x = 187,278.54/486.13
  6. Step 6: Final answer
    x = 385.25

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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.