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Finding the Fourth Proportional to 1,268.76, 1,901.78 and 828.63

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Solution

The fourth proportional to 1,268.76, 1,901.78 and 828.63 is: 1,242.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,268.76 : 1,901.78 = 828.63 : x
  2. Step 2: Convert to fraction form
    1,268.76/1,901.78 = 828.63/x
  3. Step 3: Cross multiply
    1,268.76x = 1,901.78 × 828.63
  4. Step 4: Simplify right side
    1,268.76x = 1,575,870.93
  5. Step 5: Solve for x
    x = 1,575,870.93/1,268.76
  6. Step 6: Final answer
    x = 1,242.05

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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.