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Finding the Fourth Proportional to 67.19, 92.76 and 51.31

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Solution

The fourth proportional to 67.19, 92.76 and 51.31 is: 70.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    67.19 : 92.76 = 51.31 : x
  2. Step 2: Convert to fraction form
    67.19/92.76 = 51.31/x
  3. Step 3: Cross multiply
    67.19x = 92.76 × 51.31
  4. Step 4: Simplify right side
    67.19x = 4,758.84
  5. Step 5: Solve for x
    x = 4,758.84/67.19
  6. Step 6: Final answer
    x = 70.83

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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.