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Finding the Fourth Proportional to 849.84, 1,272.72 and 438.42

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Solution

The fourth proportional to 849.84, 1,272.72 and 438.42 is: 656.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    849.84 : 1,272.72 = 438.42 : x
  2. Step 2: Convert to fraction form
    849.84/1,272.72 = 438.42/x
  3. Step 3: Cross multiply
    849.84x = 1,272.72 × 438.42
  4. Step 4: Simplify right side
    849.84x = 557,985.90
  5. Step 5: Solve for x
    x = 557,985.90/849.84
  6. Step 6: Final answer
    x = 656.58

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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.