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Finding the Fourth Proportional to 879.02, 1,213.12 and 486.12

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Solution

The fourth proportional to 879.02, 1,213.12 and 486.12 is: 670.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.02 : 1,213.12 = 486.12 : x
  2. Step 2: Convert to fraction form
    879.02/1,213.12 = 486.12/x
  3. Step 3: Cross multiply
    879.02x = 1,213.12 × 486.12
  4. Step 4: Simplify right side
    879.02x = 589,721.89
  5. Step 5: Solve for x
    x = 589,721.89/879.02
  6. Step 6: Final answer
    x = 670.89

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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.