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Finding the Fourth Proportional to 6,421.40, 9,640.20 and 3,462.20

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Solution

The fourth proportional to 6,421.40, 9,640.20 and 3,462.20 is: 5,197.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,421.40 : 9,640.20 = 3,462.20 : x
  2. Step 2: Convert to fraction form
    6,421.40/9,640.20 = 3,462.20/x
  3. Step 3: Cross multiply
    6,421.40x = 9,640.20 × 3,462.20
  4. Step 4: Simplify right side
    6,421.40x = 33,376,300.44
  5. Step 5: Solve for x
    x = 33,376,300.44/6,421.40
  6. Step 6: Final answer
    x = 5,197.67

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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.