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Finding the Fourth Proportional to 879.94, 1,214.26 and 486.94

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Solution

The fourth proportional to 879.94, 1,214.26 and 486.94 is: 671.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.94 : 1,214.26 = 486.94 : x
  2. Step 2: Convert to fraction form
    879.94/1,214.26 = 486.94/x
  3. Step 3: Cross multiply
    879.94x = 1,214.26 × 486.94
  4. Step 4: Simplify right side
    879.94x = 591,265.69
  5. Step 5: Solve for x
    x = 591,265.69/879.94
  6. Step 6: Final answer
    x = 671.94

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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.