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Finding the Fourth Proportional to 804.15, 1,208.66 and 531.18

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Solution

The fourth proportional to 804.15, 1,208.66 and 531.18 is: 798.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    804.15 : 1,208.66 = 531.18 : x
  2. Step 2: Convert to fraction form
    804.15/1,208.66 = 531.18/x
  3. Step 3: Cross multiply
    804.15x = 1,208.66 × 531.18
  4. Step 4: Simplify right side
    804.15x = 642,013.36
  5. Step 5: Solve for x
    x = 642,013.36/804.15
  6. Step 6: Final answer
    x = 798.38

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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.