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Finding the Fourth Proportional to 28,558.43, 42,836.43 and 7,781.93

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Solution

The fourth proportional to 28,558.43, 42,836.43 and 7,781.93 is: 11,672.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,558.43 : 42,836.43 = 7,781.93 : x
  2. Step 2: Convert to fraction form
    28,558.43/42,836.43 = 7,781.93/x
  3. Step 3: Cross multiply
    28,558.43x = 42,836.43 × 7,781.93
  4. Step 4: Simplify right side
    28,558.43x = 333,350,099.71
  5. Step 5: Solve for x
    x = 333,350,099.71/28,558.43
  6. Step 6: Final answer
    x = 11,672.56

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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.