Home / 15,811.85-21,821.80-8,739.67

Finding the Fourth Proportional to 15,811.85, 21,821.80 and 8,739.67

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Solution

The fourth proportional to 15,811.85, 21,821.80 and 8,739.67 is: 12,061.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,811.85 : 21,821.80 = 8,739.67 : x
  2. Step 2: Convert to fraction form
    15,811.85/21,821.80 = 8,739.67/x
  3. Step 3: Cross multiply
    15,811.85x = 21,821.80 × 8,739.67
  4. Step 4: Simplify right side
    15,811.85x = 190,715,330.81
  5. Step 5: Solve for x
    x = 190,715,330.81/15,811.85
  6. Step 6: Final answer
    x = 12,061.54

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1.5x scale

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.