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Finding the Fourth Proportional to 25,605.40, 38,408.10 and 21,231.40

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Solution

The fourth proportional to 25,605.40, 38,408.10 and 21,231.40 is: 31,847.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    25,605.40 : 38,408.10 = 21,231.40 : x
  2. Step 2: Convert to fraction form
    25,605.40/38,408.10 = 21,231.40/x
  3. Step 3: Cross multiply
    25,605.40x = 38,408.10 × 21,231.40
  4. Step 4: Simplify right side
    25,605.40x = 815,457,734.34
  5. Step 5: Solve for x
    x = 815,457,734.34/25,605.40
  6. Step 6: Final answer
    x = 31,847.10

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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.