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Finding the Fourth Proportional to 89.64, 123.68 and 55.12

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Solution

The fourth proportional to 89.64, 123.68 and 55.12 is: 76.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.64 : 123.68 = 55.12 : x
  2. Step 2: Convert to fraction form
    89.64/123.68 = 55.12/x
  3. Step 3: Cross multiply
    89.64x = 123.68 × 55.12
  4. Step 4: Simplify right side
    89.64x = 6,817.24
  5. Step 5: Solve for x
    x = 6,817.24/89.64
  6. Step 6: Final answer
    x = 76.05

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.