Home / 20,763.12-31,144.80-11,990.40

Finding the Fourth Proportional to 20,763.12, 31,144.80 and 11,990.40

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Solution

The fourth proportional to 20,763.12, 31,144.80 and 11,990.40 is: 17,985.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,763.12 : 31,144.80 = 11,990.40 : x
  2. Step 2: Convert to fraction form
    20,763.12/31,144.80 = 11,990.40/x
  3. Step 3: Cross multiply
    20,763.12x = 31,144.80 × 11,990.40
  4. Step 4: Simplify right side
    20,763.12x = 373,438,609.92
  5. Step 5: Solve for x
    x = 373,438,609.92/20,763.12
  6. Step 6: Final answer
    x = 17,985.67

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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.