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Finding the Fourth Proportional to 55.40, 83.12 and 28.35

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Solution

The fourth proportional to 55.40, 83.12 and 28.35 is: 42.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    55.40 : 83.12 = 28.35 : x
  2. Step 2: Convert to fraction form
    55.40/83.12 = 28.35/x
  3. Step 3: Cross multiply
    55.40x = 83.12 × 28.35
  4. Step 4: Simplify right side
    55.40x = 2,356.31
  5. Step 5: Solve for x
    x = 2,356.31/55.40
  6. Step 6: Final answer
    x = 42.54

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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.