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Finding the Fourth Proportional to 46.85, 64.28 and 42.74

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Solution

The fourth proportional to 46.85, 64.28 and 42.74 is: 58.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    46.85 : 64.28 = 42.74 : x
  2. Step 2: Convert to fraction form
    46.85/64.28 = 42.74/x
  3. Step 3: Cross multiply
    46.85x = 64.28 × 42.74
  4. Step 4: Simplify right side
    46.85x = 2,747.33
  5. Step 5: Solve for x
    x = 2,747.33/46.85
  6. Step 6: Final answer
    x = 58.64

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.