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Finding the Fourth Proportional to 5,286.40, 7,657.60 and 5,286.40

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Solution

The fourth proportional to 5,286.40, 7,657.60 and 5,286.40 is: 7,657.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,286.40 : 7,657.60 = 5,286.40 : x
  2. Step 2: Convert to fraction form
    5,286.40/7,657.60 = 5,286.40/x
  3. Step 3: Cross multiply
    5,286.40x = 7,657.60 × 5,286.40
  4. Step 4: Simplify right side
    5,286.40x = 40,481,136.64
  5. Step 5: Solve for x
    x = 40,481,136.64/5,286.40
  6. Step 6: Final answer
    x = 7,657.60

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.45) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.