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Finding the Fourth Proportional to 979.88, 1,352.60 and 822.20

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Solution

The fourth proportional to 979.88, 1,352.60 and 822.20 is: 1,134.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    979.88 : 1,352.60 = 822.20 : x
  2. Step 2: Convert to fraction form
    979.88/1,352.60 = 822.20/x
  3. Step 3: Cross multiply
    979.88x = 1,352.60 × 822.20
  4. Step 4: Simplify right side
    979.88x = 1,112,107.72
  5. Step 5: Solve for x
    x = 1,112,107.72/979.88
  6. Step 6: Final answer
    x = 1,134.94

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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.