Home / 13,783.20-19,019.56-7,815.40

Finding the Fourth Proportional to 13,783.20, 19,019.56 and 7,815.40

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Solution

The fourth proportional to 13,783.20, 19,019.56 and 7,815.40 is: 10,784.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,783.20 : 19,019.56 = 7,815.40 : x
  2. Step 2: Convert to fraction form
    13,783.20/19,019.56 = 7,815.40/x
  3. Step 3: Cross multiply
    13,783.20x = 19,019.56 × 7,815.40
  4. Step 4: Simplify right side
    13,783.20x = 148,645,469.22
  5. Step 5: Solve for x
    x = 148,645,469.22/13,783.20
  6. Step 6: Final answer
    x = 10,784.54

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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.