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Finding the Fourth Proportional to 28,212.96, 38,933.76 and 15,637.68

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Solution

The fourth proportional to 28,212.96, 38,933.76 and 15,637.68 is: 21,579.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,212.96 : 38,933.76 = 15,637.68 : x
  2. Step 2: Convert to fraction form
    28,212.96/38,933.76 = 15,637.68/x
  3. Step 3: Cross multiply
    28,212.96x = 38,933.76 × 15,637.68
  4. Step 4: Simplify right side
    28,212.96x = 608,833,680.08
  5. Step 5: Solve for x
    x = 608,833,680.08/28,212.96
  6. Step 6: Final answer
    x = 21,579.93

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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.