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Finding the Fourth Proportional to 70.08, 96.72 and 63.60

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Solution

The fourth proportional to 70.08, 96.72 and 63.60 is: 87.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.08 : 96.72 = 63.60 : x
  2. Step 2: Convert to fraction form
    70.08/96.72 = 63.60/x
  3. Step 3: Cross multiply
    70.08x = 96.72 × 63.60
  4. Step 4: Simplify right side
    70.08x = 6,151.39
  5. Step 5: Solve for x
    x = 6,151.39/70.08
  6. Step 6: Final answer
    x = 87.78

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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.