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Finding the Fourth Proportional to 7,277.20, 10,915.80 and 7,147.60

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Solution

The fourth proportional to 7,277.20, 10,915.80 and 7,147.60 is: 10,721.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,277.20 : 10,915.80 = 7,147.60 : x
  2. Step 2: Convert to fraction form
    7,277.20/10,915.80 = 7,147.60/x
  3. Step 3: Cross multiply
    7,277.20x = 10,915.80 × 7,147.60
  4. Step 4: Simplify right side
    7,277.20x = 78,021,772.08
  5. Step 5: Solve for x
    x = 78,021,772.08/7,277.20
  6. Step 6: Final answer
    x = 10,721.40

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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.