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Finding the Fourth Proportional to 1,576.52, 2,174.70 and 979.28

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Solution

The fourth proportional to 1,576.52, 2,174.70 and 979.28 is: 1,350.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,576.52 : 2,174.70 = 979.28 : x
  2. Step 2: Convert to fraction form
    1,576.52/2,174.70 = 979.28/x
  3. Step 3: Cross multiply
    1,576.52x = 2,174.70 × 979.28
  4. Step 4: Simplify right side
    1,576.52x = 2,129,640.22
  5. Step 5: Solve for x
    x = 2,129,640.22/1,576.52
  6. Step 6: Final answer
    x = 1,350.85

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.