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Finding the Fourth Proportional to 7,629.20, 10,711.60 and 7,629.20

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Solution

The fourth proportional to 7,629.20, 10,711.60 and 7,629.20 is: 10,711.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,629.20 : 10,711.60 = 7,629.20 : x
  2. Step 2: Convert to fraction form
    7,629.20/10,711.60 = 7,629.20/x
  3. Step 3: Cross multiply
    7,629.20x = 10,711.60 × 7,629.20
  4. Step 4: Simplify right side
    7,629.20x = 81,720,938.72
  5. Step 5: Solve for x
    x = 81,720,938.72/7,629.20
  6. Step 6: Final answer
    x = 10,711.60

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.