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Finding the Fourth Proportional to 15,806.80, 23,688.60 and 12,890.80

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Solution

The fourth proportional to 15,806.80, 23,688.60 and 12,890.80 is: 19,318.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,806.80 : 23,688.60 = 12,890.80 : x
  2. Step 2: Convert to fraction form
    15,806.80/23,688.60 = 12,890.80/x
  3. Step 3: Cross multiply
    15,806.80x = 23,688.60 × 12,890.80
  4. Step 4: Simplify right side
    15,806.80x = 305,365,004.88
  5. Step 5: Solve for x
    x = 305,365,004.88/15,806.80
  6. Step 6: Final answer
    x = 19,318.58

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1.5x scale

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.