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Finding the Fourth Proportional to 20,993.53, 28,966.10 and 11,916.88

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Solution

The fourth proportional to 20,993.53, 28,966.10 and 11,916.88 is: 16,442.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,993.53 : 28,966.10 = 11,916.88 : x
  2. Step 2: Convert to fraction form
    20,993.53/28,966.10 = 11,916.88/x
  3. Step 3: Cross multiply
    20,993.53x = 28,966.10 × 11,916.88
  4. Step 4: Simplify right side
    20,993.53x = 345,185,537.77
  5. Step 5: Solve for x
    x = 345,185,537.77/20,993.53
  6. Step 6: Final answer
    x = 16,442.47

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1.5x scale

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.