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Finding the Fourth Proportional to 19,690.40, 29,535.60 and 13,469.60

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Solution

The fourth proportional to 19,690.40, 29,535.60 and 13,469.60 is: 20,204.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,690.40 : 29,535.60 = 13,469.60 : x
  2. Step 2: Convert to fraction form
    19,690.40/29,535.60 = 13,469.60/x
  3. Step 3: Cross multiply
    19,690.40x = 29,535.60 × 13,469.60
  4. Step 4: Simplify right side
    19,690.40x = 397,832,717.76
  5. Step 5: Solve for x
    x = 397,832,717.76/19,690.40
  6. Step 6: Final answer
    x = 20,204.40

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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.