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Finding the Fourth Proportional to 438.08, 656.72 and 194.40

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Solution

The fourth proportional to 438.08, 656.72 and 194.40 is: 291.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.08 : 656.72 = 194.40 : x
  2. Step 2: Convert to fraction form
    438.08/656.72 = 194.40/x
  3. Step 3: Cross multiply
    438.08x = 656.72 × 194.40
  4. Step 4: Simplify right side
    438.08x = 127,666.37
  5. Step 5: Solve for x
    x = 127,666.37/438.08
  6. Step 6: Final answer
    x = 291.42

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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.