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Finding the Fourth Proportional to 68.32, 93.78 and 64.72

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Solution

The fourth proportional to 68.32, 93.78 and 64.72 is: 88.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    68.32 : 93.78 = 64.72 : x
  2. Step 2: Convert to fraction form
    68.32/93.78 = 64.72/x
  3. Step 3: Cross multiply
    68.32x = 93.78 × 64.72
  4. Step 4: Simplify right side
    68.32x = 6,069.44
  5. Step 5: Solve for x
    x = 6,069.44/68.32
  6. Step 6: Final answer
    x = 88.84

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.