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Finding the Fourth Proportional to 15,495.63, 21,383.80 and 8,422.08

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Solution

The fourth proportional to 15,495.63, 21,383.80 and 8,422.08 is: 11,622.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,495.63 : 21,383.80 = 8,422.08 : x
  2. Step 2: Convert to fraction form
    15,495.63/21,383.80 = 8,422.08/x
  3. Step 3: Cross multiply
    15,495.63x = 21,383.80 × 8,422.08
  4. Step 4: Simplify right side
    15,495.63x = 180,096,074.30
  5. Step 5: Solve for x
    x = 180,096,074.30/15,495.63
  6. Step 6: Final answer
    x = 11,622.38

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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.