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Finding the Fourth Proportional to 21,771.18, 32,671.34 and 7,920.18

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Solution

The fourth proportional to 21,771.18, 32,671.34 and 7,920.18 is: 11,885.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,771.18 : 32,671.34 = 7,920.18 : x
  2. Step 2: Convert to fraction form
    21,771.18/32,671.34 = 7,920.18/x
  3. Step 3: Cross multiply
    21,771.18x = 32,671.34 × 7,920.18
  4. Step 4: Simplify right side
    21,771.18x = 258,762,893.64
  5. Step 5: Solve for x
    x = 258,762,893.64/21,771.18
  6. Step 6: Final answer
    x = 11,885.57

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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.