Home / 20,285.35-30,429.60-7,140.67

Finding the Fourth Proportional to 20,285.35, 30,429.60 and 7,140.67

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Solution

The fourth proportional to 20,285.35, 30,429.60 and 7,140.67 is: 10,711.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,285.35 : 30,429.60 = 7,140.67 : x
  2. Step 2: Convert to fraction form
    20,285.35/30,429.60 = 7,140.67/x
  3. Step 3: Cross multiply
    20,285.35x = 30,429.60 × 7,140.67
  4. Step 4: Simplify right side
    20,285.35x = 217,287,731.83
  5. Step 5: Solve for x
    x = 217,287,731.83/20,285.35
  6. Step 6: Final answer
    x = 10,711.56

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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.