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Finding the Fourth Proportional to 28,679.76, 43,011.96 and 7,904.40

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Solution

The fourth proportional to 28,679.76, 43,011.96 and 7,904.40 is: 11,854.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,679.76 : 43,011.96 = 7,904.40 : x
  2. Step 2: Convert to fraction form
    28,679.76/43,011.96 = 7,904.40/x
  3. Step 3: Cross multiply
    28,679.76x = 43,011.96 × 7,904.40
  4. Step 4: Simplify right side
    28,679.76x = 339,983,736.62
  5. Step 5: Solve for x
    x = 339,983,736.62/28,679.76
  6. Step 6: Final answer
    x = 11,854.48

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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.