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Finding the Fourth Proportional to 55.63, 83.46 and 28.21

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Solution

The fourth proportional to 55.63, 83.46 and 28.21 is: 42.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    55.63 : 83.46 = 28.21 : x
  2. Step 2: Convert to fraction form
    55.63/83.46 = 28.21/x
  3. Step 3: Cross multiply
    55.63x = 83.46 × 28.21
  4. Step 4: Simplify right side
    55.63x = 2,354.41
  5. Step 5: Solve for x
    x = 2,354.41/55.63
  6. Step 6: Final answer
    x = 42.32

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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.