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Finding the Fourth Proportional to 46.20, 63.84 and 40.05

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Solution

The fourth proportional to 46.20, 63.84 and 40.05 is: 55.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    46.20 : 63.84 = 40.05 : x
  2. Step 2: Convert to fraction form
    46.20/63.84 = 40.05/x
  3. Step 3: Cross multiply
    46.20x = 63.84 × 40.05
  4. Step 4: Simplify right side
    46.20x = 2,556.79
  5. Step 5: Solve for x
    x = 2,556.79/46.20
  6. Step 6: Final answer
    x = 55.34

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.