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Finding the Fourth Proportional to 21,771.19, 32,671.35 and 7,920.19

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Solution

The fourth proportional to 21,771.19, 32,671.35 and 7,920.19 is: 11,885.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,771.19 : 32,671.35 = 7,920.19 : x
  2. Step 2: Convert to fraction form
    21,771.19/32,671.35 = 7,920.19/x
  3. Step 3: Cross multiply
    21,771.19x = 32,671.35 × 7,920.19
  4. Step 4: Simplify right side
    21,771.19x = 258,763,299.56
  5. Step 5: Solve for x
    x = 258,763,299.56/21,771.19
  6. Step 6: Final answer
    x = 11,885.58

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.