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Finding the Fourth Proportional to 8,990.64, 12,408.66 and 6,862.68

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Solution

The fourth proportional to 8,990.64, 12,408.66 and 6,862.68 is: 9,471.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,990.64 : 12,408.66 = 6,862.68 : x
  2. Step 2: Convert to fraction form
    8,990.64/12,408.66 = 6,862.68/x
  3. Step 3: Cross multiply
    8,990.64x = 12,408.66 × 6,862.68
  4. Step 4: Simplify right side
    8,990.64x = 85,156,662.81
  5. Step 5: Solve for x
    x = 85,156,662.81/8,990.64
  6. Step 6: Final answer
    x = 9,471.70

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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.