Home / 7,638.40-11,457.60-4,139.20

Finding the Fourth Proportional to 7,638.40, 11,457.60 and 4,139.20

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Solution

The fourth proportional to 7,638.40, 11,457.60 and 4,139.20 is: 6,208.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,638.40 : 11,457.60 = 4,139.20 : x
  2. Step 2: Convert to fraction form
    7,638.40/11,457.60 = 4,139.20/x
  3. Step 3: Cross multiply
    7,638.40x = 11,457.60 × 4,139.20
  4. Step 4: Simplify right side
    7,638.40x = 47,425,297.92
  5. Step 5: Solve for x
    x = 47,425,297.92/7,638.40
  6. Step 6: Final answer
    x = 6,208.80

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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.