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Finding the Fourth Proportional to 1,268.19, 1,900.80 and 859.46

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Solution

The fourth proportional to 1,268.19, 1,900.80 and 859.46 is: 1,288.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,268.19 : 1,900.80 = 859.46 : x
  2. Step 2: Convert to fraction form
    1,268.19/1,900.80 = 859.46/x
  3. Step 3: Cross multiply
    1,268.19x = 1,900.80 × 859.46
  4. Step 4: Simplify right side
    1,268.19x = 1,633,652.06
  5. Step 5: Solve for x
    x = 1,633,652.06/1,268.19
  6. Step 6: Final answer
    x = 1,288.18

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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.