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Finding the Fourth Proportional to 15,704.79, 21,672.06 and 8,631.16

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Solution

The fourth proportional to 15,704.79, 21,672.06 and 8,631.16 is: 11,910.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,704.79 : 21,672.06 = 8,631.16 : x
  2. Step 2: Convert to fraction form
    15,704.79/21,672.06 = 8,631.16/x
  3. Step 3: Cross multiply
    15,704.79x = 21,672.06 × 8,631.16
  4. Step 4: Simplify right side
    15,704.79x = 187,054,930.84
  5. Step 5: Solve for x
    x = 187,054,930.84/15,704.79
  6. Step 6: Final answer
    x = 11,910.70

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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.