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Finding the Fourth Proportional to 13,628.12, 18,806.98 and 7,659.44

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Solution

The fourth proportional to 13,628.12, 18,806.98 and 7,659.44 is: 10,570.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,628.12 : 18,806.98 = 7,659.44 : x
  2. Step 2: Convert to fraction form
    13,628.12/18,806.98 = 7,659.44/x
  3. Step 3: Cross multiply
    13,628.12x = 18,806.98 × 7,659.44
  4. Step 4: Simplify right side
    13,628.12x = 144,050,934.89
  5. Step 5: Solve for x
    x = 144,050,934.89/13,628.12
  6. Step 6: Final answer
    x = 10,570.13

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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.