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Finding the Fourth Proportional to 15,804.81, 21,810.87 and 8,731.08

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Solution

The fourth proportional to 15,804.81, 21,810.87 and 8,731.08 is: 12,049.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,804.81 : 21,810.87 = 8,731.08 : x
  2. Step 2: Convert to fraction form
    15,804.81/21,810.87 = 8,731.08/x
  3. Step 3: Cross multiply
    15,804.81x = 21,810.87 × 8,731.08
  4. Step 4: Simplify right side
    15,804.81x = 190,432,450.84
  5. Step 5: Solve for x
    x = 190,432,450.84/15,804.81
  6. Step 6: Final answer
    x = 12,049.02

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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.