Home / 21,111.54-31,678.25-15,315.99

Finding the Fourth Proportional to 21,111.54, 31,678.25 and 15,315.99

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Solution

The fourth proportional to 21,111.54, 31,678.25 and 15,315.99 is: 22,981.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,111.54 : 31,678.25 = 15,315.99 : x
  2. Step 2: Convert to fraction form
    21,111.54/31,678.25 = 15,315.99/x
  3. Step 3: Cross multiply
    21,111.54x = 31,678.25 × 15,315.99
  4. Step 4: Simplify right side
    21,111.54x = 485,183,683.64
  5. Step 5: Solve for x
    x = 485,183,683.64/21,111.54
  6. Step 6: Final answer
    x = 22,981.92

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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.