Home / 1,421.37-2,127.60-920.37

Finding the Fourth Proportional to 1,421.37, 2,127.60 and 920.37

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Solution

The fourth proportional to 1,421.37, 2,127.60 and 920.37 is: 1,377.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,421.37 : 2,127.60 = 920.37 : x
  2. Step 2: Convert to fraction form
    1,421.37/2,127.60 = 920.37/x
  3. Step 3: Cross multiply
    1,421.37x = 2,127.60 × 920.37
  4. Step 4: Simplify right side
    1,421.37x = 1,958,179.21
  5. Step 5: Solve for x
    x = 1,958,179.21/1,421.37
  6. Step 6: Final answer
    x = 1,377.67

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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.