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Finding the Fourth Proportional to 40,425.80, 60,638.70 and 20,742.80

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Solution

The fourth proportional to 40,425.80, 60,638.70 and 20,742.80 is: 31,114.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    40,425.80 : 60,638.70 = 20,742.80 : x
  2. Step 2: Convert to fraction form
    40,425.80/60,638.70 = 20,742.80/x
  3. Step 3: Cross multiply
    40,425.80x = 60,638.70 × 20,742.80
  4. Step 4: Simplify right side
    40,425.80x = 1,257,816,426.36
  5. Step 5: Solve for x
    x = 1,257,816,426.36/40,425.80
  6. Step 6: Final answer
    x = 31,114.20

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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.