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Finding the Fourth Proportional to 1,297.50, 1,790.57 and 708.05

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Solution

The fourth proportional to 1,297.50, 1,790.57 and 708.05 is: 977.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,297.50 : 1,790.57 = 708.05 : x
  2. Step 2: Convert to fraction form
    1,297.50/1,790.57 = 708.05/x
  3. Step 3: Cross multiply
    1,297.50x = 1,790.57 × 708.05
  4. Step 4: Simplify right side
    1,297.50x = 1,267,813.09
  5. Step 5: Solve for x
    x = 1,267,813.09/1,297.50
  6. Step 6: Final answer
    x = 977.12

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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.