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Finding the Fourth Proportional to 20,929.87, 28,883.85 and 11,980.25

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Solution

The fourth proportional to 20,929.87, 28,883.85 and 11,980.25 is: 16,533.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,929.87 : 28,883.85 = 11,980.25 : x
  2. Step 2: Convert to fraction form
    20,929.87/28,883.85 = 11,980.25/x
  3. Step 3: Cross multiply
    20,929.87x = 28,883.85 × 11,980.25
  4. Step 4: Simplify right side
    20,929.87x = 346,035,743.96
  5. Step 5: Solve for x
    x = 346,035,743.96/20,929.87
  6. Step 6: Final answer
    x = 16,533.11

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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.