Home / 20,929.41-28,869.78-12,425.76

Finding the Fourth Proportional to 20,929.41, 28,869.78 and 12,425.76

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Solution

The fourth proportional to 20,929.41, 28,869.78 and 12,425.76 is: 17,139.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,929.41 : 28,869.78 = 12,425.76 : x
  2. Step 2: Convert to fraction form
    20,929.41/28,869.78 = 12,425.76/x
  3. Step 3: Cross multiply
    20,929.41x = 28,869.78 × 12,425.76
  4. Step 4: Simplify right side
    20,929.41x = 358,728,813.18
  5. Step 5: Solve for x
    x = 358,728,813.18/20,929.41
  6. Step 6: Final answer
    x = 17,139.94

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.