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Finding the Fourth Proportional to 12,641.78, 18,921.36 and 11,429.22

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Solution

The fourth proportional to 12,641.78, 18,921.36 and 11,429.22 is: 17,106.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,641.78 : 18,921.36 = 11,429.22 : x
  2. Step 2: Convert to fraction form
    12,641.78/18,921.36 = 11,429.22/x
  3. Step 3: Cross multiply
    12,641.78x = 18,921.36 × 11,429.22
  4. Step 4: Simplify right side
    12,641.78x = 216,256,386.14
  5. Step 5: Solve for x
    x = 216,256,386.14/12,641.78
  6. Step 6: Final answer
    x = 17,106.48

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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.