Home / 20,871.52-28,802.64-11,921.80

Finding the Fourth Proportional to 20,871.52, 28,802.64 and 11,921.80

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Solution

The fourth proportional to 20,871.52, 28,802.64 and 11,921.80 is: 16,452.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,871.52 : 28,802.64 = 11,921.80 : x
  2. Step 2: Convert to fraction form
    20,871.52/28,802.64 = 11,921.80/x
  3. Step 3: Cross multiply
    20,871.52x = 28,802.64 × 11,921.80
  4. Step 4: Simplify right side
    20,871.52x = 343,379,313.55
  5. Step 5: Solve for x
    x = 343,379,313.55/20,871.52
  6. Step 6: Final answer
    x = 16,452.05

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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.