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Finding the Fourth Proportional to 12,469, 18,707.55 and 8,724.64

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Solution

The fourth proportional to 12,469, 18,707.55 and 8,724.64 is: 13,089.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,469 : 18,707.55 = 8,724.64 : x
  2. Step 2: Convert to fraction form
    12,469/18,707.55 = 8,724.64/x
  3. Step 3: Cross multiply
    12,469x = 18,707.55 × 8,724.64
  4. Step 4: Simplify right side
    12,469x = 163,216,639.03
  5. Step 5: Solve for x
    x = 163,216,639.03/12,469
  6. Step 6: Final answer
    x = 13,089.79

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1.5x scale

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.