Home / 21,315.86-31,935.47-12,545.99

Finding the Fourth Proportional to 21,315.86, 31,935.47 and 12,545.99

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Solution

The fourth proportional to 21,315.86, 31,935.47 and 12,545.99 is: 18,796.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,315.86 : 31,935.47 = 12,545.99 : x
  2. Step 2: Convert to fraction form
    21,315.86/31,935.47 = 12,545.99/x
  3. Step 3: Cross multiply
    21,315.86x = 31,935.47 × 12,545.99
  4. Step 4: Simplify right side
    21,315.86x = 400,661,864.86
  5. Step 5: Solve for x
    x = 400,661,864.86/21,315.86
  6. Step 6: Final answer
    x = 18,796.42

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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.