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Finding the Fourth Proportional to 1,211.51, 1,813.84 and 771.67

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Solution

The fourth proportional to 1,211.51, 1,813.84 and 771.67 is: 1,155.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,211.51 : 1,813.84 = 771.67 : x
  2. Step 2: Convert to fraction form
    1,211.51/1,813.84 = 771.67/x
  3. Step 3: Cross multiply
    1,211.51x = 1,813.84 × 771.67
  4. Step 4: Simplify right side
    1,211.51x = 1,399,672.99
  5. Step 5: Solve for x
    x = 1,399,672.99/1,211.51
  6. Step 6: Final answer
    x = 1,155.32

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.