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Finding the Fourth Proportional to 8,990.84, 12,408.81 and 5,409.41

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Solution

The fourth proportional to 8,990.84, 12,408.81 and 5,409.41 is: 7,465.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,990.84 : 12,408.81 = 5,409.41 : x
  2. Step 2: Convert to fraction form
    8,990.84/12,408.81 = 5,409.41/x
  3. Step 3: Cross multiply
    8,990.84x = 12,408.81 × 5,409.41
  4. Step 4: Simplify right side
    8,990.84x = 67,124,392.21
  5. Step 5: Solve for x
    x = 67,124,392.21/8,990.84
  6. Step 6: Final answer
    x = 7,465.87

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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.