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Finding the Fourth Proportional to 20,960.98, 28,915 and 15,916.84

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Solution

The fourth proportional to 20,960.98, 28,915 and 15,916.84 is: 21,956.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,960.98 : 28,915 = 15,916.84 : x
  2. Step 2: Convert to fraction form
    20,960.98/28,915 = 15,916.84/x
  3. Step 3: Cross multiply
    20,960.98x = 28,915 × 15,916.84
  4. Step 4: Simplify right side
    20,960.98x = 460,235,428.60
  5. Step 5: Solve for x
    x = 460,235,428.60/20,960.98
  6. Step 6: Final answer
    x = 21,956.77

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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.