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Finding the Fourth Proportional to 51.39, 70.92 and 47.43

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Solution

The fourth proportional to 51.39, 70.92 and 47.43 is: 65.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    51.39 : 70.92 = 47.43 : x
  2. Step 2: Convert to fraction form
    51.39/70.92 = 47.43/x
  3. Step 3: Cross multiply
    51.39x = 70.92 × 47.43
  4. Step 4: Simplify right side
    51.39x = 3,363.74
  5. Step 5: Solve for x
    x = 3,363.74/51.39
  6. Step 6: Final answer
    x = 65.46

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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.