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Finding the Fourth Proportional to 12,678.20, 19,001.10 and 11,220.20

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Solution

The fourth proportional to 12,678.20, 19,001.10 and 11,220.20 is: 16,815.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,678.20 : 19,001.10 = 11,220.20 : x
  2. Step 2: Convert to fraction form
    12,678.20/19,001.10 = 11,220.20/x
  3. Step 3: Cross multiply
    12,678.20x = 19,001.10 × 11,220.20
  4. Step 4: Simplify right side
    12,678.20x = 213,196,142.22
  5. Step 5: Solve for x
    x = 213,196,142.22/12,678.20
  6. Step 6: Final answer
    x = 16,815.96

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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.