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Finding the Fourth Proportional to 49.36, 74.40 and 46.72

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Solution

The fourth proportional to 49.36, 74.40 and 46.72 is: 70.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    49.36 : 74.40 = 46.72 : x
  2. Step 2: Convert to fraction form
    49.36/74.40 = 46.72/x
  3. Step 3: Cross multiply
    49.36x = 74.40 × 46.72
  4. Step 4: Simplify right side
    49.36x = 3,475.97
  5. Step 5: Solve for x
    x = 3,475.97/49.36
  6. Step 6: Final answer
    x = 70.42

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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.