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Finding the Fourth Proportional to 5,147.76, 7,721.64 and 3,615.60

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Solution

The fourth proportional to 5,147.76, 7,721.64 and 3,615.60 is: 5,423.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,147.76 : 7,721.64 = 3,615.60 : x
  2. Step 2: Convert to fraction form
    5,147.76/7,721.64 = 3,615.60/x
  3. Step 3: Cross multiply
    5,147.76x = 7,721.64 × 3,615.60
  4. Step 4: Simplify right side
    5,147.76x = 27,918,361.58
  5. Step 5: Solve for x
    x = 27,918,361.58/5,147.76
  6. Step 6: Final answer
    x = 5,423.40

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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.