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Finding the Fourth Proportional to 13,698, 18,903.56 and 7,728.53

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Solution

The fourth proportional to 13,698, 18,903.56 and 7,728.53 is: 10,665.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,698 : 18,903.56 = 7,728.53 : x
  2. Step 2: Convert to fraction form
    13,698/18,903.56 = 7,728.53/x
  3. Step 3: Cross multiply
    13,698x = 18,903.56 × 7,728.53
  4. Step 4: Simplify right side
    13,698x = 146,096,597.41
  5. Step 5: Solve for x
    x = 146,096,597.41/13,698
  6. Step 6: Final answer
    x = 10,665.54

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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.