Home / 2,158.70-2,979.34-1,319.90

Finding the Fourth Proportional to 2,158.70, 2,979.34 and 1,319.90

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Solution

The fourth proportional to 2,158.70, 2,979.34 and 1,319.90 is: 1,821.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,158.70 : 2,979.34 = 1,319.90 : x
  2. Step 2: Convert to fraction form
    2,158.70/2,979.34 = 1,319.90/x
  3. Step 3: Cross multiply
    2,158.70x = 2,979.34 × 1,319.90
  4. Step 4: Simplify right side
    2,158.70x = 3,932,430.87
  5. Step 5: Solve for x
    x = 3,932,430.87/2,158.70
  6. Step 6: Final answer
    x = 1,821.67

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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.