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Finding the Fourth Proportional to 51.33, 70.77 and 39.64

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Solution

The fourth proportional to 51.33, 70.77 and 39.64 is: 54.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    51.33 : 70.77 = 39.64 : x
  2. Step 2: Convert to fraction form
    51.33/70.77 = 39.64/x
  3. Step 3: Cross multiply
    51.33x = 70.77 × 39.64
  4. Step 4: Simplify right side
    51.33x = 2,805.43
  5. Step 5: Solve for x
    x = 2,805.43/51.33
  6. Step 6: Final answer
    x = 54.65

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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.