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Finding the Fourth Proportional to 8,459.81, 12,689.40 and 2,219.77

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Solution

The fourth proportional to 8,459.81, 12,689.40 and 2,219.77 is: 3,329.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,459.81 : 12,689.40 = 2,219.77 : x
  2. Step 2: Convert to fraction form
    8,459.81/12,689.40 = 2,219.77/x
  3. Step 3: Cross multiply
    8,459.81x = 12,689.40 × 2,219.77
  4. Step 4: Simplify right side
    8,459.81x = 28,167,485.99
  5. Step 5: Solve for x
    x = 28,167,485.99/8,459.81
  6. Step 6: Final answer
    x = 3,329.56

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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.