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Finding the Fourth Proportional to 12,800.80, 19,199.94 and 4,479.28

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Solution

The fourth proportional to 12,800.80, 19,199.94 and 4,479.28 is: 6,718.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,800.80 : 19,199.94 = 4,479.28 : x
  2. Step 2: Convert to fraction form
    12,800.80/19,199.94 = 4,479.28/x
  3. Step 3: Cross multiply
    12,800.80x = 19,199.94 × 4,479.28
  4. Step 4: Simplify right side
    12,800.80x = 86,001,907.24
  5. Step 5: Solve for x
    x = 86,001,907.24/12,800.80
  6. Step 6: Final answer
    x = 6,718.48

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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.