Home / 21,289.20-31,948.20-11,929.20

Finding the Fourth Proportional to 21,289.20, 31,948.20 and 11,929.20

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Solution

The fourth proportional to 21,289.20, 31,948.20 and 11,929.20 is: 17,901.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,289.20 : 31,948.20 = 11,929.20 : x
  2. Step 2: Convert to fraction form
    21,289.20/31,948.20 = 11,929.20/x
  3. Step 3: Cross multiply
    21,289.20x = 31,948.20 × 11,929.20
  4. Step 4: Simplify right side
    21,289.20x = 381,116,467.44
  5. Step 5: Solve for x
    x = 381,116,467.44/21,289.20
  6. Step 6: Final answer
    x = 17,901.87

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1.5x scale

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.