Home / 21,145.76-31,708.70-12,263.61

Finding the Fourth Proportional to 21,145.76, 31,708.70 and 12,263.61

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Solution

The fourth proportional to 21,145.76, 31,708.70 and 12,263.61 is: 18,389.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,145.76 : 31,708.70 = 12,263.61 : x
  2. Step 2: Convert to fraction form
    21,145.76/31,708.70 = 12,263.61/x
  3. Step 3: Cross multiply
    21,145.76x = 31,708.70 × 12,263.61
  4. Step 4: Simplify right side
    21,145.76x = 388,863,196.54
  5. Step 5: Solve for x
    x = 388,863,196.54/21,145.76
  6. Step 6: Final answer
    x = 18,389.65

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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.