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Finding the Fourth Proportional to 3,576.79, 5,365.20 and 979.72

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Solution

The fourth proportional to 3,576.79, 5,365.20 and 979.72 is: 1,469.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,576.79 : 5,365.20 = 979.72 : x
  2. Step 2: Convert to fraction form
    3,576.79/5,365.20 = 979.72/x
  3. Step 3: Cross multiply
    3,576.79x = 5,365.20 × 979.72
  4. Step 4: Simplify right side
    3,576.79x = 5,256,393.74
  5. Step 5: Solve for x
    x = 5,256,393.74/3,576.79
  6. Step 6: Final answer
    x = 1,469.58

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Similar ratio
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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.