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Finding the Fourth Proportional to 879.16, 1,213.38 and 669

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Solution

The fourth proportional to 879.16, 1,213.38 and 669 is: 923.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.16 : 1,213.38 = 669 : x
  2. Step 2: Convert to fraction form
    879.16/1,213.38 = 669/x
  3. Step 3: Cross multiply
    879.16x = 1,213.38 × 669
  4. Step 4: Simplify right side
    879.16x = 811,751.22
  5. Step 5: Solve for x
    x = 811,751.22/879.16
  6. Step 6: Final answer
    x = 923.33

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1.5x scale

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.