Home / 19,905.20-29,857.80-13,684.40

Finding the Fourth Proportional to 19,905.20, 29,857.80 and 13,684.40

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Solution

The fourth proportional to 19,905.20, 29,857.80 and 13,684.40 is: 20,526.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,905.20 : 29,857.80 = 13,684.40 : x
  2. Step 2: Convert to fraction form
    19,905.20/29,857.80 = 13,684.40/x
  3. Step 3: Cross multiply
    19,905.20x = 29,857.80 × 13,684.40
  4. Step 4: Simplify right side
    19,905.20x = 408,586,078.32
  5. Step 5: Solve for x
    x = 408,586,078.32/19,905.20
  6. Step 6: Final answer
    x = 20,526.60

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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.