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Finding the Fourth Proportional to 35.46, 48.96 and 28.20

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Solution

The fourth proportional to 35.46, 48.96 and 28.20 is: 38.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    35.46 : 48.96 = 28.20 : x
  2. Step 2: Convert to fraction form
    35.46/48.96 = 28.20/x
  3. Step 3: Cross multiply
    35.46x = 48.96 × 28.20
  4. Step 4: Simplify right side
    35.46x = 1,380.67
  5. Step 5: Solve for x
    x = 1,380.67/35.46
  6. Step 6: Final answer
    x = 38.94

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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.