Home / 13,690.07-18,890.43-7,639.61

Finding the Fourth Proportional to 13,690.07, 18,890.43 and 7,639.61

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Solution

The fourth proportional to 13,690.07, 18,890.43 and 7,639.61 is: 10,541.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,690.07 : 18,890.43 = 7,639.61 : x
  2. Step 2: Convert to fraction form
    13,690.07/18,890.43 = 7,639.61/x
  3. Step 3: Cross multiply
    13,690.07x = 18,890.43 × 7,639.61
  4. Step 4: Simplify right side
    13,690.07x = 144,315,517.93
  5. Step 5: Solve for x
    x = 144,315,517.93/13,690.07
  6. Step 6: Final answer
    x = 10,541.62

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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.