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Finding the Fourth Proportional to 40,405.16, 60,540.90 and 20,656.55

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Solution

The fourth proportional to 40,405.16, 60,540.90 and 20,656.55 is: 30,950.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    40,405.16 : 60,540.90 = 20,656.55 : x
  2. Step 2: Convert to fraction form
    40,405.16/60,540.90 = 20,656.55/x
  3. Step 3: Cross multiply
    40,405.16x = 60,540.90 × 20,656.55
  4. Step 4: Simplify right side
    40,405.16x = 1,250,565,825.19
  5. Step 5: Solve for x
    x = 1,250,565,825.19/40,405.16
  6. Step 6: Final answer
    x = 30,950.65

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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.