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Finding the Fourth Proportional to 15,684.70, 21,644.04 and 8,971.18

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Solution

The fourth proportional to 15,684.70, 21,644.04 and 8,971.18 is: 12,379.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,684.70 : 21,644.04 = 8,971.18 : x
  2. Step 2: Convert to fraction form
    15,684.70/21,644.04 = 8,971.18/x
  3. Step 3: Cross multiply
    15,684.70x = 21,644.04 × 8,971.18
  4. Step 4: Simplify right side
    15,684.70x = 194,172,578.77
  5. Step 5: Solve for x
    x = 194,172,578.77/15,684.70
  6. Step 6: Final answer
    x = 12,379.74

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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.