Home / 20,915.49-28,856.31-11,956.65

Finding the Fourth Proportional to 20,915.49, 28,856.31 and 11,956.65

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Solution

The fourth proportional to 20,915.49, 28,856.31 and 11,956.65 is: 16,496.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,915.49 : 28,856.31 = 11,956.65 : x
  2. Step 2: Convert to fraction form
    20,915.49/28,856.31 = 11,956.65/x
  3. Step 3: Cross multiply
    20,915.49x = 28,856.31 × 11,956.65
  4. Step 4: Simplify right side
    20,915.49x = 345,024,798.96
  5. Step 5: Solve for x
    x = 345,024,798.96/20,915.49
  6. Step 6: Final answer
    x = 16,496.14

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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.