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Finding the Fourth Proportional to 21,989.70, 32,984.55 and 6,408.90

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Solution

The fourth proportional to 21,989.70, 32,984.55 and 6,408.90 is: 9,613.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,989.70 : 32,984.55 = 6,408.90 : x
  2. Step 2: Convert to fraction form
    21,989.70/32,984.55 = 6,408.90/x
  3. Step 3: Cross multiply
    21,989.70x = 32,984.55 × 6,408.90
  4. Step 4: Simplify right side
    21,989.70x = 211,394,682.50
  5. Step 5: Solve for x
    x = 211,394,682.50/21,989.70
  6. Step 6: Final answer
    x = 9,613.35

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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.