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Finding the Fourth Proportional to 879.30, 1,213.20 and 506.20

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Solution

The fourth proportional to 879.30, 1,213.20 and 506.20 is: 698.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.30 : 1,213.20 = 506.20 : x
  2. Step 2: Convert to fraction form
    879.30/1,213.20 = 506.20/x
  3. Step 3: Cross multiply
    879.30x = 1,213.20 × 506.20
  4. Step 4: Simplify right side
    879.30x = 614,121.84
  5. Step 5: Solve for x
    x = 614,121.84/879.30
  6. Step 6: Final answer
    x = 698.42

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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.