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Finding the Fourth Proportional to 13,408.55, 18,503.88 and 7,440.34

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Solution

The fourth proportional to 13,408.55, 18,503.88 and 7,440.34 is: 10,267.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,408.55 : 18,503.88 = 7,440.34 : x
  2. Step 2: Convert to fraction form
    13,408.55/18,503.88 = 7,440.34/x
  3. Step 3: Cross multiply
    13,408.55x = 18,503.88 × 7,440.34
  4. Step 4: Simplify right side
    13,408.55x = 137,675,066.00
  5. Step 5: Solve for x
    x = 137,675,066.00/13,408.55
  6. Step 6: Final answer
    x = 10,267.71

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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.