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Finding the Fourth Proportional to 28,464.88, 39,282.86 and 15,719.86

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Solution

The fourth proportional to 28,464.88, 39,282.86 and 15,719.86 is: 21,694.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,464.88 : 39,282.86 = 15,719.86 : x
  2. Step 2: Convert to fraction form
    28,464.88/39,282.86 = 15,719.86/x
  3. Step 3: Cross multiply
    28,464.88x = 39,282.86 × 15,719.86
  4. Step 4: Simplify right side
    28,464.88x = 617,521,059.60
  5. Step 5: Solve for x
    x = 617,521,059.60/28,464.88
  6. Step 6: Final answer
    x = 21,694.14

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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.