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Finding the Fourth Proportional to 38,988.74, 53,802.93 and 21,990.29

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Solution

The fourth proportional to 38,988.74, 53,802.93 and 21,990.29 is: 30,345.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,988.74 : 53,802.93 = 21,990.29 : x
  2. Step 2: Convert to fraction form
    38,988.74/53,802.93 = 21,990.29/x
  3. Step 3: Cross multiply
    38,988.74x = 53,802.93 × 21,990.29
  4. Step 4: Simplify right side
    38,988.74x = 1,183,141,847.00
  5. Step 5: Solve for x
    x = 1,183,141,847.00/38,988.74
  6. Step 6: Final answer
    x = 30,345.73

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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.