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Finding the Fourth Proportional to 879.17, 1,213.25 and 486.18

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Solution

The fourth proportional to 879.17, 1,213.25 and 486.18 is: 670.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.17 : 1,213.25 = 486.18 : x
  2. Step 2: Convert to fraction form
    879.17/1,213.25 = 486.18/x
  3. Step 3: Cross multiply
    879.17x = 1,213.25 × 486.18
  4. Step 4: Simplify right side
    879.17x = 589,855.45
  5. Step 5: Solve for x
    x = 589,855.45/879.17
  6. Step 6: Final answer
    x = 670.93

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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.