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Finding the Fourth Proportional to 70.32, 96.96 and 55.68

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Solution

The fourth proportional to 70.32, 96.96 and 55.68 is: 76.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.32 : 96.96 = 55.68 : x
  2. Step 2: Convert to fraction form
    70.32/96.96 = 55.68/x
  3. Step 3: Cross multiply
    70.32x = 96.96 × 55.68
  4. Step 4: Simplify right side
    70.32x = 5,398.73
  5. Step 5: Solve for x
    x = 5,398.73/70.32
  6. Step 6: Final answer
    x = 76.77

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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.