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Finding the Fourth Proportional to 174.42, 240.64 and 100.72

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Solution

The fourth proportional to 174.42, 240.64 and 100.72 is: 138.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    174.42 : 240.64 = 100.72 : x
  2. Step 2: Convert to fraction form
    174.42/240.64 = 100.72/x
  3. Step 3: Cross multiply
    174.42x = 240.64 × 100.72
  4. Step 4: Simplify right side
    174.42x = 24,237.31
  5. Step 5: Solve for x
    x = 24,237.31/174.42
  6. Step 6: Final answer
    x = 138.96

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.