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Finding the Fourth Proportional to 438.33, 656.23 and 342.21

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Solution

The fourth proportional to 438.33, 656.23 and 342.21 is: 512.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.33 : 656.23 = 342.21 : x
  2. Step 2: Convert to fraction form
    438.33/656.23 = 342.21/x
  3. Step 3: Cross multiply
    438.33x = 656.23 × 342.21
  4. Step 4: Simplify right side
    438.33x = 224,568.47
  5. Step 5: Solve for x
    x = 224,568.47/438.33
  6. Step 6: Final answer
    x = 512.33

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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.