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Finding the Fourth Proportional to 11,388.48, 15,731.04 and 8,731.32

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Solution

The fourth proportional to 11,388.48, 15,731.04 and 8,731.32 is: 12,060.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,388.48 : 15,731.04 = 8,731.32 : x
  2. Step 2: Convert to fraction form
    11,388.48/15,731.04 = 8,731.32/x
  3. Step 3: Cross multiply
    11,388.48x = 15,731.04 × 8,731.32
  4. Step 4: Simplify right side
    11,388.48x = 137,352,744.17
  5. Step 5: Solve for x
    x = 137,352,744.17/11,388.48
  6. Step 6: Final answer
    x = 12,060.67

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.