Home / 20,810.84-31,201.68-7,661.51

Finding the Fourth Proportional to 20,810.84, 31,201.68 and 7,661.51

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Solution

The fourth proportional to 20,810.84, 31,201.68 and 7,661.51 is: 11,486.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,810.84 : 31,201.68 = 7,661.51 : x
  2. Step 2: Convert to fraction form
    20,810.84/31,201.68 = 7,661.51/x
  3. Step 3: Cross multiply
    20,810.84x = 31,201.68 × 7,661.51
  4. Step 4: Simplify right side
    20,810.84x = 239,051,827.33
  5. Step 5: Solve for x
    x = 239,051,827.33/20,810.84
  6. Step 6: Final answer
    x = 11,486.89

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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.