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Finding the Fourth Proportional to 1,297.78, 1,790.89 and 708.30

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Solution

The fourth proportional to 1,297.78, 1,790.89 and 708.30 is: 977.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,297.78 : 1,790.89 = 708.30 : x
  2. Step 2: Convert to fraction form
    1,297.78/1,790.89 = 708.30/x
  3. Step 3: Cross multiply
    1,297.78x = 1,790.89 × 708.30
  4. Step 4: Simplify right side
    1,297.78x = 1,268,485.62
  5. Step 5: Solve for x
    x = 1,268,485.62/1,297.78
  6. Step 6: Final answer
    x = 977.43

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1.5x scale

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.