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Finding the Fourth Proportional to 72.42, 108.64 and 49.64

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Solution

The fourth proportional to 72.42, 108.64 and 49.64 is: 74.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.42 : 108.64 = 49.64 : x
  2. Step 2: Convert to fraction form
    72.42/108.64 = 49.64/x
  3. Step 3: Cross multiply
    72.42x = 108.64 × 49.64
  4. Step 4: Simplify right side
    72.42x = 5,392.89
  5. Step 5: Solve for x
    x = 5,392.89/72.42
  6. Step 6: Final answer
    x = 74.47

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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.