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Finding the Fourth Proportional to 1,811.35, 2,716.01 and 921.67

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Solution

The fourth proportional to 1,811.35, 2,716.01 and 921.67 is: 1,381.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,811.35 : 2,716.01 = 921.67 : x
  2. Step 2: Convert to fraction form
    1,811.35/2,716.01 = 921.67/x
  3. Step 3: Cross multiply
    1,811.35x = 2,716.01 × 921.67
  4. Step 4: Simplify right side
    1,811.35x = 2,503,264.94
  5. Step 5: Solve for x
    x = 2,503,264.94/1,811.35
  6. Step 6: Final answer
    x = 1,381.99

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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.