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Finding the Fourth Proportional to 438.09, 655.11 and 356.28

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Solution

The fourth proportional to 438.09, 655.11 and 356.28 is: 532.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.09 : 655.11 = 356.28 : x
  2. Step 2: Convert to fraction form
    438.09/655.11 = 356.28/x
  3. Step 3: Cross multiply
    438.09x = 655.11 × 356.28
  4. Step 4: Simplify right side
    438.09x = 233,402.59
  5. Step 5: Solve for x
    x = 233,402.59/438.09
  6. Step 6: Final answer
    x = 532.77

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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.