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Finding the Fourth Proportional to 9,418.56, 12,993.90 and 5,438.90

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Solution

The fourth proportional to 9,418.56, 12,993.90 and 5,438.90 is: 7,503.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,418.56 : 12,993.90 = 5,438.90 : x
  2. Step 2: Convert to fraction form
    9,418.56/12,993.90 = 5,438.90/x
  3. Step 3: Cross multiply
    9,418.56x = 12,993.90 × 5,438.90
  4. Step 4: Simplify right side
    9,418.56x = 70,672,457.74
  5. Step 5: Solve for x
    x = 70,672,457.74/9,418.56
  6. Step 6: Final answer
    x = 7,503.53

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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.