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Finding the Fourth Proportional to 1,311.75, 1,811.06 and 913.27

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Solution

The fourth proportional to 1,311.75, 1,811.06 and 913.27 is: 1,260.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,311.75 : 1,811.06 = 913.27 : x
  2. Step 2: Convert to fraction form
    1,311.75/1,811.06 = 913.27/x
  3. Step 3: Cross multiply
    1,311.75x = 1,811.06 × 913.27
  4. Step 4: Simplify right side
    1,311.75x = 1,653,986.77
  5. Step 5: Solve for x
    x = 1,653,986.77/1,311.75
  6. Step 6: Final answer
    x = 1,260.90

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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.