Home / 1,268.12-1,902.20-690.99

Finding the Fourth Proportional to 1,268.12, 1,902.20 and 690.99

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Solution

The fourth proportional to 1,268.12, 1,902.20 and 690.99 is: 1,036.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,268.12 : 1,902.20 = 690.99 : x
  2. Step 2: Convert to fraction form
    1,268.12/1,902.20 = 690.99/x
  3. Step 3: Cross multiply
    1,268.12x = 1,902.20 × 690.99
  4. Step 4: Simplify right side
    1,268.12x = 1,314,397.72
  5. Step 5: Solve for x
    x = 1,314,397.72/1,268.12
  6. Step 6: Final answer
    x = 1,036.50

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.