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Finding the Fourth Proportional to 174.72, 262.40 and 78.72

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Solution

The fourth proportional to 174.72, 262.40 and 78.72 is: 118.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    174.72 : 262.40 = 78.72 : x
  2. Step 2: Convert to fraction form
    174.72/262.40 = 78.72/x
  3. Step 3: Cross multiply
    174.72x = 262.40 × 78.72
  4. Step 4: Simplify right side
    174.72x = 20,656.13
  5. Step 5: Solve for x
    x = 20,656.13/174.72
  6. Step 6: Final answer
    x = 118.22

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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.