Home / 1,270.89-1,749.60-1,139.67

Finding the Fourth Proportional to 1,270.89, 1,749.60 and 1,139.67

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Solution

The fourth proportional to 1,270.89, 1,749.60 and 1,139.67 is: 1,568.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,270.89 : 1,749.60 = 1,139.67 : x
  2. Step 2: Convert to fraction form
    1,270.89/1,749.60 = 1,139.67/x
  3. Step 3: Cross multiply
    1,270.89x = 1,749.60 × 1,139.67
  4. Step 4: Simplify right side
    1,270.89x = 1,993,966.63
  5. Step 5: Solve for x
    x = 1,993,966.63/1,270.89
  6. Step 6: Final answer
    x = 1,568.95

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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.