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Finding the Fourth Proportional to 21,991.51, 30,347.76 and 11,919.52

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Solution

The fourth proportional to 21,991.51, 30,347.76 and 11,919.52 is: 16,448.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,991.51 : 30,347.76 = 11,919.52 : x
  2. Step 2: Convert to fraction form
    21,991.51/30,347.76 = 11,919.52/x
  3. Step 3: Cross multiply
    21,991.51x = 30,347.76 × 11,919.52
  4. Step 4: Simplify right side
    21,991.51x = 361,730,732.28
  5. Step 5: Solve for x
    x = 361,730,732.28/21,991.51
  6. Step 6: Final answer
    x = 16,448.65

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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.