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Finding the Fourth Proportional to 810.44, 1,118.42 and 515.64

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Solution

The fourth proportional to 810.44, 1,118.42 and 515.64 is: 711.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    810.44 : 1,118.42 = 515.64 : x
  2. Step 2: Convert to fraction form
    810.44/1,118.42 = 515.64/x
  3. Step 3: Cross multiply
    810.44x = 1,118.42 × 515.64
  4. Step 4: Simplify right side
    810.44x = 576,702.09
  5. Step 5: Solve for x
    x = 576,702.09/810.44
  6. Step 6: Final answer
    x = 711.59

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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.