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Finding the Fourth Proportional to 15,888.19, 21,928.31 and 8,816.89

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Solution

The fourth proportional to 15,888.19, 21,928.31 and 8,816.89 is: 12,168.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,888.19 : 21,928.31 = 8,816.89 : x
  2. Step 2: Convert to fraction form
    15,888.19/21,928.31 = 8,816.89/x
  3. Step 3: Cross multiply
    15,888.19x = 21,928.31 × 8,816.89
  4. Step 4: Simplify right side
    15,888.19x = 193,339,497.16
  5. Step 5: Solve for x
    x = 193,339,497.16/15,888.19
  6. Step 6: Final answer
    x = 12,168.76

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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.