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Finding the Fourth Proportional to 1,141.71, 1,709.37 and 729.81

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Solution

The fourth proportional to 1,141.71, 1,709.37 and 729.81 is: 1,092.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,141.71 : 1,709.37 = 729.81 : x
  2. Step 2: Convert to fraction form
    1,141.71/1,709.37 = 729.81/x
  3. Step 3: Cross multiply
    1,141.71x = 1,709.37 × 729.81
  4. Step 4: Simplify right side
    1,141.71x = 1,247,515.32
  5. Step 5: Solve for x
    x = 1,247,515.32/1,141.71
  6. Step 6: Final answer
    x = 1,092.67

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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.