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Finding the Fourth Proportional to 21,989.77, 30,345.76 and 11,918.11

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Solution

The fourth proportional to 21,989.77, 30,345.76 and 11,918.11 is: 16,446.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,989.77 : 30,345.76 = 11,918.11 : x
  2. Step 2: Convert to fraction form
    21,989.77/30,345.76 = 11,918.11/x
  3. Step 3: Cross multiply
    21,989.77x = 30,345.76 × 11,918.11
  4. Step 4: Simplify right side
    21,989.77x = 361,664,105.71
  5. Step 5: Solve for x
    x = 361,664,105.71/21,989.77
  6. Step 6: Final answer
    x = 16,446.93

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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.