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Finding the Fourth Proportional to 7,122.60, 10,683.90 and 6,636.60

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Solution

The fourth proportional to 7,122.60, 10,683.90 and 6,636.60 is: 9,954.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,122.60 : 10,683.90 = 6,636.60 : x
  2. Step 2: Convert to fraction form
    7,122.60/10,683.90 = 6,636.60/x
  3. Step 3: Cross multiply
    7,122.60x = 10,683.90 × 6,636.60
  4. Step 4: Simplify right side
    7,122.60x = 70,904,770.74
  5. Step 5: Solve for x
    x = 70,904,770.74/7,122.60
  6. Step 6: Final answer
    x = 9,954.90

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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.