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Finding the Fourth Proportional to 21,477.63, 29,640.75 and 11,919.32

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Solution

The fourth proportional to 21,477.63, 29,640.75 and 11,919.32 is: 16,449.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,477.63 : 29,640.75 = 11,919.32 : x
  2. Step 2: Convert to fraction form
    21,477.63/29,640.75 = 11,919.32/x
  3. Step 3: Cross multiply
    21,477.63x = 29,640.75 × 11,919.32
  4. Step 4: Simplify right side
    21,477.63x = 353,297,688.19
  5. Step 5: Solve for x
    x = 353,297,688.19/21,477.63
  6. Step 6: Final answer
    x = 16,449.56

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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.