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Finding the Fourth Proportional to 15,884.20, 21,918.54 and 8,810.44

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Solution

The fourth proportional to 15,884.20, 21,918.54 and 8,810.44 is: 12,157.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,884.20 : 21,918.54 = 8,810.44 : x
  2. Step 2: Convert to fraction form
    15,884.20/21,918.54 = 8,810.44/x
  3. Step 3: Cross multiply
    15,884.20x = 21,918.54 × 8,810.44
  4. Step 4: Simplify right side
    15,884.20x = 193,111,981.56
  5. Step 5: Solve for x
    x = 193,111,981.56/15,884.20
  6. Step 6: Final answer
    x = 12,157.49

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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.