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Finding the Fourth Proportional to 1,012.42, 1,396.74 and 619.30

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Solution

The fourth proportional to 1,012.42, 1,396.74 and 619.30 is: 854.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,012.42 : 1,396.74 = 619.30 : x
  2. Step 2: Convert to fraction form
    1,012.42/1,396.74 = 619.30/x
  3. Step 3: Cross multiply
    1,012.42x = 1,396.74 × 619.30
  4. Step 4: Simplify right side
    1,012.42x = 865,001.08
  5. Step 5: Solve for x
    x = 865,001.08/1,012.42
  6. Step 6: Final answer
    x = 854.39

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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.