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Finding the Fourth Proportional to 13,209.12, 18,228.48 and 7,620

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Solution

The fourth proportional to 13,209.12, 18,228.48 and 7,620 is: 10,515.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,209.12 : 18,228.48 = 7,620 : x
  2. Step 2: Convert to fraction form
    13,209.12/18,228.48 = 7,620/x
  3. Step 3: Cross multiply
    13,209.12x = 18,228.48 × 7,620
  4. Step 4: Simplify right side
    13,209.12x = 138,901,017.60
  5. Step 5: Solve for x
    x = 138,901,017.60/13,209.12
  6. Step 6: Final answer
    x = 10,515.54

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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.