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Finding the Fourth Proportional to 804.48, 1,207.08 and 438.72

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Solution

The fourth proportional to 804.48, 1,207.08 and 438.72 is: 658.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    804.48 : 1,207.08 = 438.72 : x
  2. Step 2: Convert to fraction form
    804.48/1,207.08 = 438.72/x
  3. Step 3: Cross multiply
    804.48x = 1,207.08 × 438.72
  4. Step 4: Simplify right side
    804.48x = 529,570.14
  5. Step 5: Solve for x
    x = 529,570.14/804.48
  6. Step 6: Final answer
    x = 658.28

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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.