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Finding the Fourth Proportional to 67.32, 92.79 and 64.80

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Solution

The fourth proportional to 67.32, 92.79 and 64.80 is: 89.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    67.32 : 92.79 = 64.80 : x
  2. Step 2: Convert to fraction form
    67.32/92.79 = 64.80/x
  3. Step 3: Cross multiply
    67.32x = 92.79 × 64.80
  4. Step 4: Simplify right side
    67.32x = 6,012.79
  5. Step 5: Solve for x
    x = 6,012.79/67.32
  6. Step 6: Final answer
    x = 89.32

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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.