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Finding the Fourth Proportional to 3,173.76, 4,760.80 and 865.28

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Solution

The fourth proportional to 3,173.76, 4,760.80 and 865.28 is: 1,297.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,173.76 : 4,760.80 = 865.28 : x
  2. Step 2: Convert to fraction form
    3,173.76/4,760.80 = 865.28/x
  3. Step 3: Cross multiply
    3,173.76x = 4,760.80 × 865.28
  4. Step 4: Simplify right side
    3,173.76x = 4,119,425.02
  5. Step 5: Solve for x
    x = 4,119,425.02/3,173.76
  6. Step 6: Final answer
    x = 1,297.96

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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.