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Finding the Fourth Proportional to 13,969.70, 20,978.85 and 7,408.70

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Solution

The fourth proportional to 13,969.70, 20,978.85 and 7,408.70 is: 11,125.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,969.70 : 20,978.85 = 7,408.70 : x
  2. Step 2: Convert to fraction form
    13,969.70/20,978.85 = 7,408.70/x
  3. Step 3: Cross multiply
    13,969.70x = 20,978.85 × 7,408.70
  4. Step 4: Simplify right side
    13,969.70x = 155,426,006.00
  5. Step 5: Solve for x
    x = 155,426,006.00/13,969.70
  6. Step 6: Final answer
    x = 11,125.94

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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.