Home / 20,290.72-30,430.32-6,439.36

Finding the Fourth Proportional to 20,290.72, 30,430.32 and 6,439.36

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Solution

The fourth proportional to 20,290.72, 30,430.32 and 6,439.36 is: 9,657.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,290.72 : 30,430.32 = 6,439.36 : x
  2. Step 2: Convert to fraction form
    20,290.72/30,430.32 = 6,439.36/x
  3. Step 3: Cross multiply
    20,290.72x = 30,430.32 × 6,439.36
  4. Step 4: Simplify right side
    20,290.72x = 195,951,785.40
  5. Step 5: Solve for x
    x = 195,951,785.40/20,290.72
  6. Step 6: Final answer
    x = 9,657.21

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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.