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Finding the Fourth Proportional to 1,098.41, 1,515.86 and 620.03

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Solution

The fourth proportional to 1,098.41, 1,515.86 and 620.03 is: 855.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,098.41 : 1,515.86 = 620.03 : x
  2. Step 2: Convert to fraction form
    1,098.41/1,515.86 = 620.03/x
  3. Step 3: Cross multiply
    1,098.41x = 1,515.86 × 620.03
  4. Step 4: Simplify right side
    1,098.41x = 939,869.29
  5. Step 5: Solve for x
    x = 939,869.29/1,098.41
  6. Step 6: Final answer
    x = 855.66

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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.