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Finding the Fourth Proportional to 15,874.30, 21,905.65 and 8,704.21

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Solution

The fourth proportional to 15,874.30, 21,905.65 and 8,704.21 is: 12,011.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,874.30 : 21,905.65 = 8,704.21 : x
  2. Step 2: Convert to fraction form
    15,874.30/21,905.65 = 8,704.21/x
  3. Step 3: Cross multiply
    15,874.30x = 21,905.65 × 8,704.21
  4. Step 4: Simplify right side
    15,874.30x = 190,671,377.79
  5. Step 5: Solve for x
    x = 190,671,377.79/15,874.30
  6. Step 6: Final answer
    x = 12,011.33

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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.