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Finding the Fourth Proportional to 1,012.67, 1,397.28 and 619.41

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Solution

The fourth proportional to 1,012.67, 1,397.28 and 619.41 is: 854.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,012.67 : 1,397.28 = 619.41 : x
  2. Step 2: Convert to fraction form
    1,012.67/1,397.28 = 619.41/x
  3. Step 3: Cross multiply
    1,012.67x = 1,397.28 × 619.41
  4. Step 4: Simplify right side
    1,012.67x = 865,489.20
  5. Step 5: Solve for x
    x = 865,489.20/1,012.67
  6. Step 6: Final answer
    x = 854.66

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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.