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Finding the Fourth Proportional to 28,494, 39,321 and 15,918.84

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Solution

The fourth proportional to 28,494, 39,321 and 15,918.84 is: 21,967.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,494 : 39,321 = 15,918.84 : x
  2. Step 2: Convert to fraction form
    28,494/39,321 = 15,918.84/x
  3. Step 3: Cross multiply
    28,494x = 39,321 × 15,918.84
  4. Step 4: Simplify right side
    28,494x = 625,944,707.64
  5. Step 5: Solve for x
    x = 625,944,707.64/28,494
  6. Step 6: Final answer
    x = 21,967.60

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.