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Finding the Fourth Proportional to 922.15, 1,268.75 and 699.80

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Solution

The fourth proportional to 922.15, 1,268.75 and 699.80 is: 962.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    922.15 : 1,268.75 = 699.80 : x
  2. Step 2: Convert to fraction form
    922.15/1,268.75 = 699.80/x
  3. Step 3: Cross multiply
    922.15x = 1,268.75 × 699.80
  4. Step 4: Simplify right side
    922.15x = 887,867.75
  5. Step 5: Solve for x
    x = 887,867.75/922.15
  6. Step 6: Final answer
    x = 962.83

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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.