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Finding the Fourth Proportional to 13,442.40, 20,160.90 and 6,422.40

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Solution

The fourth proportional to 13,442.40, 20,160.90 and 6,422.40 is: 9,632.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,442.40 : 20,160.90 = 6,422.40 : x
  2. Step 2: Convert to fraction form
    13,442.40/20,160.90 = 6,422.40/x
  3. Step 3: Cross multiply
    13,442.40x = 20,160.90 × 6,422.40
  4. Step 4: Simplify right side
    13,442.40x = 129,481,364.16
  5. Step 5: Solve for x
    x = 129,481,364.16/13,442.40
  6. Step 6: Final answer
    x = 9,632.31

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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.