Home / 21,218.11-31,830.62-7,179.01

Finding the Fourth Proportional to 21,218.11, 31,830.62 and 7,179.01

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Solution

The fourth proportional to 21,218.11, 31,830.62 and 7,179.01 is: 10,769.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,218.11 : 31,830.62 = 7,179.01 : x
  2. Step 2: Convert to fraction form
    21,218.11/31,830.62 = 7,179.01/x
  3. Step 3: Cross multiply
    21,218.11x = 31,830.62 × 7,179.01
  4. Step 4: Simplify right side
    21,218.11x = 228,512,223.81
  5. Step 5: Solve for x
    x = 228,512,223.81/21,218.11
  6. Step 6: Final answer
    x = 10,769.68

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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.