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Finding the Fourth Proportional to 13,313.76, 18,374.40 and 8,281.20

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Solution

The fourth proportional to 13,313.76, 18,374.40 and 8,281.20 is: 11,428.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,313.76 : 18,374.40 = 8,281.20 : x
  2. Step 2: Convert to fraction form
    13,313.76/18,374.40 = 8,281.20/x
  3. Step 3: Cross multiply
    13,313.76x = 18,374.40 × 8,281.20
  4. Step 4: Simplify right side
    13,313.76x = 152,162,081.28
  5. Step 5: Solve for x
    x = 152,162,081.28/13,313.76
  6. Step 6: Final answer
    x = 11,428.93

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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.