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Finding the Fourth Proportional to 13,128.80, 19,693.20 and 6,108.80

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Solution

The fourth proportional to 13,128.80, 19,693.20 and 6,108.80 is: 9,163.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,128.80 : 19,693.20 = 6,108.80 : x
  2. Step 2: Convert to fraction form
    13,128.80/19,693.20 = 6,108.80/x
  3. Step 3: Cross multiply
    13,128.80x = 19,693.20 × 6,108.80
  4. Step 4: Simplify right side
    13,128.80x = 120,301,820.16
  5. Step 5: Solve for x
    x = 120,301,820.16/13,128.80
  6. Step 6: Final answer
    x = 9,163.20

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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.