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Finding the Fourth Proportional to 70,271.80, 105,425.70 and 40,636.60

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Solution

The fourth proportional to 70,271.80, 105,425.70 and 40,636.60 is: 60,965.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,271.80 : 105,425.70 = 40,636.60 : x
  2. Step 2: Convert to fraction form
    70,271.80/105,425.70 = 40,636.60/x
  3. Step 3: Cross multiply
    70,271.80x = 105,425.70 × 40,636.60
  4. Step 4: Simplify right side
    70,271.80x = 4,284,142,000.62
  5. Step 5: Solve for x
    x = 4,284,142,000.62/70,271.80
  6. Step 6: Final answer
    x = 60,965.31

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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.