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Finding the Fourth Proportional to 389,408.70, 537,391 and 228,379.89

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Solution

The fourth proportional to 389,408.70, 537,391 and 228,379.89 is: 315,168.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,408.70 : 537,391 = 228,379.89 : x
  2. Step 2: Convert to fraction form
    389,408.70/537,391 = 228,379.89/x
  3. Step 3: Cross multiply
    389,408.70x = 537,391 × 228,379.89
  4. Step 4: Simplify right side
    389,408.70x = 122,729,297,466.99
  5. Step 5: Solve for x
    x = 122,729,297,466.99/389,408.70
  6. Step 6: Final answer
    x = 315,168.35

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.