Home / 20,919.93-28,871.22-11,970.36

Finding the Fourth Proportional to 20,919.93, 28,871.22 and 11,970.36

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Solution

The fourth proportional to 20,919.93, 28,871.22 and 11,970.36 is: 16,520.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,919.93 : 28,871.22 = 11,970.36 : x
  2. Step 2: Convert to fraction form
    20,919.93/28,871.22 = 11,970.36/x
  3. Step 3: Cross multiply
    20,919.93x = 28,871.22 × 11,970.36
  4. Step 4: Simplify right side
    20,919.93x = 345,598,897.04
  5. Step 5: Solve for x
    x = 345,598,897.04/20,919.93
  6. Step 6: Final answer
    x = 16,520.08

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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.