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Finding the Fourth Proportional to 49.37, 74.32 and 45.12

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Solution

The fourth proportional to 49.37, 74.32 and 45.12 is: 67.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    49.37 : 74.32 = 45.12 : x
  2. Step 2: Convert to fraction form
    49.37/74.32 = 45.12/x
  3. Step 3: Cross multiply
    49.37x = 74.32 × 45.12
  4. Step 4: Simplify right side
    49.37x = 3,353.32
  5. Step 5: Solve for x
    x = 3,353.32/49.37
  6. Step 6: Final answer
    x = 67.92

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.