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Finding the Fourth Proportional to 28,003.59, 38,642.67 and 15,428.34

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Solution

The fourth proportional to 28,003.59, 38,642.67 and 15,428.34 is: 21,289.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,003.59 : 38,642.67 = 15,428.34 : x
  2. Step 2: Convert to fraction form
    28,003.59/38,642.67 = 15,428.34/x
  3. Step 3: Cross multiply
    28,003.59x = 38,642.67 × 15,428.34
  4. Step 4: Simplify right side
    28,003.59x = 596,192,251.27
  5. Step 5: Solve for x
    x = 596,192,251.27/28,003.59
  6. Step 6: Final answer
    x = 21,289.85

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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.