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Finding the Fourth Proportional to 51.37, 76.89 and 45.60

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Solution

The fourth proportional to 51.37, 76.89 and 45.60 is: 68.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    51.37 : 76.89 = 45.60 : x
  2. Step 2: Convert to fraction form
    51.37/76.89 = 45.60/x
  3. Step 3: Cross multiply
    51.37x = 76.89 × 45.60
  4. Step 4: Simplify right side
    51.37x = 3,506.07
  5. Step 5: Solve for x
    x = 3,506.07/51.37
  6. Step 6: Final answer
    x = 68.25

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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.