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Finding the Fourth Proportional to 11,920.55, 17,868.51 and 7,768.67

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Solution

The fourth proportional to 11,920.55, 17,868.51 and 7,768.67 is: 11,644.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,920.55 : 17,868.51 = 7,768.67 : x
  2. Step 2: Convert to fraction form
    11,920.55/17,868.51 = 7,768.67/x
  3. Step 3: Cross multiply
    11,920.55x = 17,868.51 × 7,768.67
  4. Step 4: Simplify right side
    11,920.55x = 138,814,468.24
  5. Step 5: Solve for x
    x = 138,814,468.24/11,920.55
  6. Step 6: Final answer
    x = 11,644.98

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Why These Related Problems?

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