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Finding the Fourth Proportional to 1,012.40, 1,396.92 and 570.28

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Solution

The fourth proportional to 1,012.40, 1,396.92 and 570.28 is: 786.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,012.40 : 1,396.92 = 570.28 : x
  2. Step 2: Convert to fraction form
    1,012.40/1,396.92 = 570.28/x
  3. Step 3: Cross multiply
    1,012.40x = 1,396.92 × 570.28
  4. Step 4: Simplify right side
    1,012.40x = 796,635.54
  5. Step 5: Solve for x
    x = 796,635.54/1,012.40
  6. Step 6: Final answer
    x = 786.88

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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.