Home / 8,128.40-11,215.20-4,771.40

Finding the Fourth Proportional to 8,128.40, 11,215.20 and 4,771.40

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Solution

The fourth proportional to 8,128.40, 11,215.20 and 4,771.40 is: 6,583.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,128.40 : 11,215.20 = 4,771.40 : x
  2. Step 2: Convert to fraction form
    8,128.40/11,215.20 = 4,771.40/x
  3. Step 3: Cross multiply
    8,128.40x = 11,215.20 × 4,771.40
  4. Step 4: Simplify right side
    8,128.40x = 53,512,205.28
  5. Step 5: Solve for x
    x = 53,512,205.28/8,128.40
  6. Step 6: Final answer
    x = 6,583.36

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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.