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Finding the Fourth Proportional to 11,159.28, 15,394.86 and 7,178.88

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Solution

The fourth proportional to 11,159.28, 15,394.86 and 7,178.88 is: 9,903.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,159.28 : 15,394.86 = 7,178.88 : x
  2. Step 2: Convert to fraction form
    11,159.28/15,394.86 = 7,178.88/x
  3. Step 3: Cross multiply
    11,159.28x = 15,394.86 × 7,178.88
  4. Step 4: Simplify right side
    11,159.28x = 110,517,852.56
  5. Step 5: Solve for x
    x = 110,517,852.56/11,159.28
  6. Step 6: Final answer
    x = 9,903.67

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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.