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Finding the Fourth Proportional to 28,412.53, 42,618.89 and 8,691

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Solution

The fourth proportional to 28,412.53, 42,618.89 and 8,691 is: 13,036.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,412.53 : 42,618.89 = 8,691 : x
  2. Step 2: Convert to fraction form
    28,412.53/42,618.89 = 8,691/x
  3. Step 3: Cross multiply
    28,412.53x = 42,618.89 × 8,691
  4. Step 4: Simplify right side
    28,412.53x = 370,400,772.99
  5. Step 5: Solve for x
    x = 370,400,772.99/28,412.53
  6. Step 6: Final answer
    x = 13,036.53

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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.