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Finding the Fourth Proportional to 1,235.70, 1,705.41 and 711.75

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Solution

The fourth proportional to 1,235.70, 1,705.41 and 711.75 is: 982.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,235.70 : 1,705.41 = 711.75 : x
  2. Step 2: Convert to fraction form
    1,235.70/1,705.41 = 711.75/x
  3. Step 3: Cross multiply
    1,235.70x = 1,705.41 × 711.75
  4. Step 4: Simplify right side
    1,235.70x = 1,213,825.57
  5. Step 5: Solve for x
    x = 1,213,825.57/1,235.70
  6. Step 6: Final answer
    x = 982.30

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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.