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Finding the Fourth Proportional to 804.36, 1,207.61 and 689.55

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Solution

The fourth proportional to 804.36, 1,207.61 and 689.55 is: 1,035.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    804.36 : 1,207.61 = 689.55 : x
  2. Step 2: Convert to fraction form
    804.36/1,207.61 = 689.55/x
  3. Step 3: Cross multiply
    804.36x = 1,207.61 × 689.55
  4. Step 4: Simplify right side
    804.36x = 832,702.09
  5. Step 5: Solve for x
    x = 832,702.09/804.36
  6. Step 6: Final answer
    x = 1,035.23

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.