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Finding the Fourth Proportional to 46.42, 69.60 and 20.74

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Solution

The fourth proportional to 46.42, 69.60 and 20.74 is: 31.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    46.42 : 69.60 = 20.74 : x
  2. Step 2: Convert to fraction form
    46.42/69.60 = 20.74/x
  3. Step 3: Cross multiply
    46.42x = 69.60 × 20.74
  4. Step 4: Simplify right side
    46.42x = 1,443.50
  5. Step 5: Solve for x
    x = 1,443.50/46.42
  6. Step 6: Final answer
    x = 31.10

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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.