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Finding the Fourth Proportional to 438.13, 656.79 and 194.46

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Solution

The fourth proportional to 438.13, 656.79 and 194.46 is: 291.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.13 : 656.79 = 194.46 : x
  2. Step 2: Convert to fraction form
    438.13/656.79 = 194.46/x
  3. Step 3: Cross multiply
    438.13x = 656.79 × 194.46
  4. Step 4: Simplify right side
    438.13x = 127,719.38
  5. Step 5: Solve for x
    x = 127,719.38/438.13
  6. Step 6: Final answer
    x = 291.51

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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.