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Finding the Fourth Proportional to 28,938.46, 43,410.80 and 9,212.40

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Solution

The fourth proportional to 28,938.46, 43,410.80 and 9,212.40 is: 13,819.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,938.46 : 43,410.80 = 9,212.40 : x
  2. Step 2: Convert to fraction form
    28,938.46/43,410.80 = 9,212.40/x
  3. Step 3: Cross multiply
    28,938.46x = 43,410.80 × 9,212.40
  4. Step 4: Simplify right side
    28,938.46x = 399,917,653.92
  5. Step 5: Solve for x
    x = 399,917,653.92/28,938.46
  6. Step 6: Final answer
    x = 13,819.59

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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.