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Finding the Fourth Proportional to 1,012.56, 1,397.97 and 619.98

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Solution

The fourth proportional to 1,012.56, 1,397.97 and 619.98 is: 855.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,012.56 : 1,397.97 = 619.98 : x
  2. Step 2: Convert to fraction form
    1,012.56/1,397.97 = 619.98/x
  3. Step 3: Cross multiply
    1,012.56x = 1,397.97 × 619.98
  4. Step 4: Simplify right side
    1,012.56x = 866,713.44
  5. Step 5: Solve for x
    x = 866,713.44/1,012.56
  6. Step 6: Final answer
    x = 855.96

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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.