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Finding the Fourth Proportional to 21,819.51, 30,103.65 and 13,863.69

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Solution

The fourth proportional to 21,819.51, 30,103.65 and 13,863.69 is: 19,127.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,819.51 : 30,103.65 = 13,863.69 : x
  2. Step 2: Convert to fraction form
    21,819.51/30,103.65 = 13,863.69/x
  3. Step 3: Cross multiply
    21,819.51x = 30,103.65 × 13,863.69
  4. Step 4: Simplify right side
    21,819.51x = 417,347,671.47
  5. Step 5: Solve for x
    x = 417,347,671.47/21,819.51
  6. Step 6: Final answer
    x = 19,127.27

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.