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Finding the Fourth Proportional to 40,156.80, 60,244.80 and 20,438.40

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Solution

The fourth proportional to 40,156.80, 60,244.80 and 20,438.40 is: 30,662.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    40,156.80 : 60,244.80 = 20,438.40 : x
  2. Step 2: Convert to fraction form
    40,156.80/60,244.80 = 20,438.40/x
  3. Step 3: Cross multiply
    40,156.80x = 60,244.80 × 20,438.40
  4. Step 4: Simplify right side
    40,156.80x = 1,231,307,320.32
  5. Step 5: Solve for x
    x = 1,231,307,320.32/40,156.80
  6. Step 6: Final answer
    x = 30,662.49

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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.