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Finding the Fourth Proportional to 38,988.36, 53,803.28 and 21,992.64

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Solution

The fourth proportional to 38,988.36, 53,803.28 and 21,992.64 is: 30,349.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,988.36 : 53,803.28 = 21,992.64 : x
  2. Step 2: Convert to fraction form
    38,988.36/53,803.28 = 21,992.64/x
  3. Step 3: Cross multiply
    38,988.36x = 53,803.28 × 21,992.64
  4. Step 4: Simplify right side
    38,988.36x = 1,183,276,057.90
  5. Step 5: Solve for x
    x = 1,183,276,057.90/38,988.36
  6. Step 6: Final answer
    x = 30,349.47

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.