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Finding the Fourth Proportional to 1,297.68, 1,790.80 and 708.20

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Solution

The fourth proportional to 1,297.68, 1,790.80 and 708.20 is: 977.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,297.68 : 1,790.80 = 708.20 : x
  2. Step 2: Convert to fraction form
    1,297.68/1,790.80 = 708.20/x
  3. Step 3: Cross multiply
    1,297.68x = 1,790.80 × 708.20
  4. Step 4: Simplify right side
    1,297.68x = 1,268,244.56
  5. Step 5: Solve for x
    x = 1,268,244.56/1,297.68
  6. Step 6: Final answer
    x = 977.32

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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.