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Finding the Fourth Proportional to 12,639.85, 18,950.85 and 5,616.05

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Solution

The fourth proportional to 12,639.85, 18,950.85 and 5,616.05 is: 8,420.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,639.85 : 18,950.85 = 5,616.05 : x
  2. Step 2: Convert to fraction form
    12,639.85/18,950.85 = 5,616.05/x
  3. Step 3: Cross multiply
    12,639.85x = 18,950.85 × 5,616.05
  4. Step 4: Simplify right side
    12,639.85x = 106,428,826.39
  5. Step 5: Solve for x
    x = 106,428,826.39/12,639.85
  6. Step 6: Final answer
    x = 8,420.10

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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.