Home / 20,880.79-28,817.58-11,929.64

Finding the Fourth Proportional to 20,880.79, 28,817.58 and 11,929.64

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Solution

The fourth proportional to 20,880.79, 28,817.58 and 11,929.64 is: 16,464.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,880.79 : 28,817.58 = 11,929.64 : x
  2. Step 2: Convert to fraction form
    20,880.79/28,817.58 = 11,929.64/x
  3. Step 3: Cross multiply
    20,880.79x = 28,817.58 × 11,929.64
  4. Step 4: Simplify right side
    20,880.79x = 343,783,151.34
  5. Step 5: Solve for x
    x = 343,783,151.34/20,880.79
  6. Step 6: Final answer
    x = 16,464.09

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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.