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Finding the Fourth Proportional to 51.15, 70.52 and 39.51

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Solution

The fourth proportional to 51.15, 70.52 and 39.51 is: 54.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    51.15 : 70.52 = 39.51 : x
  2. Step 2: Convert to fraction form
    51.15/70.52 = 39.51/x
  3. Step 3: Cross multiply
    51.15x = 70.52 × 39.51
  4. Step 4: Simplify right side
    51.15x = 2,786.05
  5. Step 5: Solve for x
    x = 2,786.05/51.15
  6. Step 6: Final answer
    x = 54.47

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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.