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Finding the Fourth Proportional to 28,472.85, 42,716.43 and 12,886.29

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Solution

The fourth proportional to 28,472.85, 42,716.43 and 12,886.29 is: 19,332.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,472.85 : 42,716.43 = 12,886.29 : x
  2. Step 2: Convert to fraction form
    28,472.85/42,716.43 = 12,886.29/x
  3. Step 3: Cross multiply
    28,472.85x = 42,716.43 × 12,886.29
  4. Step 4: Simplify right side
    28,472.85x = 550,456,304.74
  5. Step 5: Solve for x
    x = 550,456,304.74/28,472.85
  6. Step 6: Final answer
    x = 19,332.67

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.