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Finding the Fourth Proportional to 1,254.63, 1,731.80 and 806.90

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Solution

The fourth proportional to 1,254.63, 1,731.80 and 806.90 is: 1,113.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,254.63 : 1,731.80 = 806.90 : x
  2. Step 2: Convert to fraction form
    1,254.63/1,731.80 = 806.90/x
  3. Step 3: Cross multiply
    1,254.63x = 1,731.80 × 806.90
  4. Step 4: Simplify right side
    1,254.63x = 1,397,395.77
  5. Step 5: Solve for x
    x = 1,397,395.77/1,254.63
  6. Step 6: Final answer
    x = 1,113.79

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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.