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Finding the Fourth Proportional to 18,361.69, 25,339.23 and 9,978.19

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Solution

The fourth proportional to 18,361.69, 25,339.23 and 9,978.19 is: 13,769.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,361.69 : 25,339.23 = 9,978.19 : x
  2. Step 2: Convert to fraction form
    18,361.69/25,339.23 = 9,978.19/x
  3. Step 3: Cross multiply
    18,361.69x = 25,339.23 × 9,978.19
  4. Step 4: Simplify right side
    18,361.69x = 252,839,588.05
  5. Step 5: Solve for x
    x = 252,839,588.05/18,361.69
  6. Step 6: Final answer
    x = 13,769.95

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Half scale
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Double scale
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Similar ratio
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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.