Home / 13,923.72-20,871-10,220.40

Finding the Fourth Proportional to 13,923.72, 20,871 and 10,220.40

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Solution

The fourth proportional to 13,923.72, 20,871 and 10,220.40 is: 15,319.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,923.72 : 20,871 = 10,220.40 : x
  2. Step 2: Convert to fraction form
    13,923.72/20,871 = 10,220.40/x
  3. Step 3: Cross multiply
    13,923.72x = 20,871 × 10,220.40
  4. Step 4: Simplify right side
    13,923.72x = 213,309,968.40
  5. Step 5: Solve for x
    x = 213,309,968.40/13,923.72
  6. Step 6: Final answer
    x = 15,319.90

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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.