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Finding the Fourth Proportional to 28,705.30, 43,045.80 and 8,978.56

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Solution

The fourth proportional to 28,705.30, 43,045.80 and 8,978.56 is: 13,464.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,705.30 : 43,045.80 = 8,978.56 : x
  2. Step 2: Convert to fraction form
    28,705.30/43,045.80 = 8,978.56/x
  3. Step 3: Cross multiply
    28,705.30x = 43,045.80 × 8,978.56
  4. Step 4: Simplify right side
    28,705.30x = 386,489,298.05
  5. Step 5: Solve for x
    x = 386,489,298.05/28,705.30
  6. Step 6: Final answer
    x = 13,464.04

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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.