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Finding the Fourth Proportional to 8,128.10, 11,213.10 and 7,130.30

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Solution

The fourth proportional to 8,128.10, 11,213.10 and 7,130.30 is: 9,836.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,128.10 : 11,213.10 = 7,130.30 : x
  2. Step 2: Convert to fraction form
    8,128.10/11,213.10 = 7,130.30/x
  3. Step 3: Cross multiply
    8,128.10x = 11,213.10 × 7,130.30
  4. Step 4: Simplify right side
    8,128.10x = 79,952,766.93
  5. Step 5: Solve for x
    x = 79,952,766.93/8,128.10
  6. Step 6: Final answer
    x = 9,836.59

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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.