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Finding the Fourth Proportional to 21,963.80, 30,308.11 and 13,009.79

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Solution

The fourth proportional to 21,963.80, 30,308.11 and 13,009.79 is: 17,952.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,963.80 : 30,308.11 = 13,009.79 : x
  2. Step 2: Convert to fraction form
    21,963.80/30,308.11 = 13,009.79/x
  3. Step 3: Cross multiply
    21,963.80x = 30,308.11 × 13,009.79
  4. Step 4: Simplify right side
    21,963.80x = 394,301,929.81
  5. Step 5: Solve for x
    x = 394,301,929.81/21,963.80
  6. Step 6: Final answer
    x = 17,952.36

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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.