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Finding the Fourth Proportional to 12,512, 18,768 and 4,718.99

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Solution

The fourth proportional to 12,512, 18,768 and 4,718.99 is: 7,078.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,512 : 18,768 = 4,718.99 : x
  2. Step 2: Convert to fraction form
    12,512/18,768 = 4,718.99/x
  3. Step 3: Cross multiply
    12,512x = 18,768 × 4,718.99
  4. Step 4: Simplify right side
    12,512x = 88,566,004.32
  5. Step 5: Solve for x
    x = 88,566,004.32/12,512
  6. Step 6: Final answer
    x = 7,078.49

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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.