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Finding the Fourth Proportional to 1,265.87, 1,749.33 and 912.98

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Solution

The fourth proportional to 1,265.87, 1,749.33 and 912.98 is: 1,261.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,265.87 : 1,749.33 = 912.98 : x
  2. Step 2: Convert to fraction form
    1,265.87/1,749.33 = 912.98/x
  3. Step 3: Cross multiply
    1,265.87x = 1,749.33 × 912.98
  4. Step 4: Simplify right side
    1,265.87x = 1,597,107.68
  5. Step 5: Solve for x
    x = 1,597,107.68/1,265.87
  6. Step 6: Final answer
    x = 1,261.67

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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.