Home / 20,929.77-31,389.80-7,788.33

Finding the Fourth Proportional to 20,929.77, 31,389.80 and 7,788.33

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Solution

The fourth proportional to 20,929.77, 31,389.80 and 7,788.33 is: 11,680.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,929.77 : 31,389.80 = 7,788.33 : x
  2. Step 2: Convert to fraction form
    20,929.77/31,389.80 = 7,788.33/x
  3. Step 3: Cross multiply
    20,929.77x = 31,389.80 × 7,788.33
  4. Step 4: Simplify right side
    20,929.77x = 244,474,082.09
  5. Step 5: Solve for x
    x = 244,474,082.09/20,929.77
  6. Step 6: Final answer
    x = 11,680.69

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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.