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Finding the Fourth Proportional to 20,703.60, 28,576.80 and 18,662.40

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Solution

The fourth proportional to 20,703.60, 28,576.80 and 18,662.40 is: 25,759.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,703.60 : 28,576.80 = 18,662.40 : x
  2. Step 2: Convert to fraction form
    20,703.60/28,576.80 = 18,662.40/x
  3. Step 3: Cross multiply
    20,703.60x = 28,576.80 × 18,662.40
  4. Step 4: Simplify right side
    20,703.60x = 533,311,672.32
  5. Step 5: Solve for x
    x = 533,311,672.32/20,703.60
  6. Step 6: Final answer
    x = 25,759.37

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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.