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Finding the Fourth Proportional to 71,408.85, 107,128.25 and 21,492.60

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Solution

The fourth proportional to 71,408.85, 107,128.25 and 21,492.60 is: 32,243.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,408.85 : 107,128.25 = 21,492.60 : x
  2. Step 2: Convert to fraction form
    71,408.85/107,128.25 = 21,492.60/x
  3. Step 3: Cross multiply
    71,408.85x = 107,128.25 × 21,492.60
  4. Step 4: Simplify right side
    71,408.85x = 2,302,464,625.95
  5. Step 5: Solve for x
    x = 2,302,464,625.95/71,408.85
  6. Step 6: Final answer
    x = 32,243.41

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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.