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Finding the Fourth Proportional to 51.13, 70.55 and 28.13

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Solution

The fourth proportional to 51.13, 70.55 and 28.13 is: 38.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    51.13 : 70.55 = 28.13 : x
  2. Step 2: Convert to fraction form
    51.13/70.55 = 28.13/x
  3. Step 3: Cross multiply
    51.13x = 70.55 × 28.13
  4. Step 4: Simplify right side
    51.13x = 1,984.57
  5. Step 5: Solve for x
    x = 1,984.57/51.13
  6. Step 6: Final answer
    x = 38.81

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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.