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Finding the Fourth Proportional to 20,660, 28,585.86 and 18,012.92

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Solution

The fourth proportional to 20,660, 28,585.86 and 18,012.92 is: 24,923.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,660 : 28,585.86 = 18,012.92 : x
  2. Step 2: Convert to fraction form
    20,660/28,585.86 = 18,012.92/x
  3. Step 3: Cross multiply
    20,660x = 28,585.86 × 18,012.92
  4. Step 4: Simplify right side
    20,660x = 514,914,809.31
  5. Step 5: Solve for x
    x = 514,914,809.31/20,660
  6. Step 6: Final answer
    x = 24,923.27

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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.