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Finding the Fourth Proportional to 28,489.65, 42,734.51 and 7,429.68

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Solution

The fourth proportional to 28,489.65, 42,734.51 and 7,429.68 is: 11,144.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,489.65 : 42,734.51 = 7,429.68 : x
  2. Step 2: Convert to fraction form
    28,489.65/42,734.51 = 7,429.68/x
  3. Step 3: Cross multiply
    28,489.65x = 42,734.51 × 7,429.68
  4. Step 4: Simplify right side
    28,489.65x = 317,503,483.44
  5. Step 5: Solve for x
    x = 317,503,483.44/28,489.65
  6. Step 6: Final answer
    x = 11,144.52

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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.