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Finding the Fourth Proportional to 804.72, 1,208.72 and 531.20

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Solution

The fourth proportional to 804.72, 1,208.72 and 531.20 is: 797.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    804.72 : 1,208.72 = 531.20 : x
  2. Step 2: Convert to fraction form
    804.72/1,208.72 = 531.20/x
  3. Step 3: Cross multiply
    804.72x = 1,208.72 × 531.20
  4. Step 4: Simplify right side
    804.72x = 642,072.06
  5. Step 5: Solve for x
    x = 642,072.06/804.72
  6. Step 6: Final answer
    x = 797.88

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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.