Home / 20,928.33-31,390.07-7,779.20

Finding the Fourth Proportional to 20,928.33, 31,390.07 and 7,779.20

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Solution

The fourth proportional to 20,928.33, 31,390.07 and 7,779.20 is: 11,667.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,928.33 : 31,390.07 = 7,779.20 : x
  2. Step 2: Convert to fraction form
    20,928.33/31,390.07 = 7,779.20/x
  3. Step 3: Cross multiply
    20,928.33x = 31,390.07 × 7,779.20
  4. Step 4: Simplify right side
    20,928.33x = 244,189,436.70
  5. Step 5: Solve for x
    x = 244,189,436.70/20,928.33
  6. Step 6: Final answer
    x = 11,667.89

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1.5x scale

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.