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Finding the Fourth Proportional to 13,298.80, 18,351.78 and 7,629.64

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Solution

The fourth proportional to 13,298.80, 18,351.78 and 7,629.64 is: 10,528.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,298.80 : 18,351.78 = 7,629.64 : x
  2. Step 2: Convert to fraction form
    13,298.80/18,351.78 = 7,629.64/x
  3. Step 3: Cross multiply
    13,298.80x = 18,351.78 × 7,629.64
  4. Step 4: Simplify right side
    13,298.80x = 140,017,474.76
  5. Step 5: Solve for x
    x = 140,017,474.76/13,298.80
  6. Step 6: Final answer
    x = 10,528.58

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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.