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Finding the Fourth Proportional to 438.63, 657.94 and 178.74

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Solution

The fourth proportional to 438.63, 657.94 and 178.74 is: 268.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.63 : 657.94 = 178.74 : x
  2. Step 2: Convert to fraction form
    438.63/657.94 = 178.74/x
  3. Step 3: Cross multiply
    438.63x = 657.94 × 178.74
  4. Step 4: Simplify right side
    438.63x = 117,600.20
  5. Step 5: Solve for x
    x = 117,600.20/438.63
  6. Step 6: Final answer
    x = 268.11

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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.