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Finding the Fourth Proportional to 89.10, 122.88 and 64.56

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Solution

The fourth proportional to 89.10, 122.88 and 64.56 is: 89.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.10 : 122.88 = 64.56 : x
  2. Step 2: Convert to fraction form
    89.10/122.88 = 64.56/x
  3. Step 3: Cross multiply
    89.10x = 122.88 × 64.56
  4. Step 4: Simplify right side
    89.10x = 7,933.13
  5. Step 5: Solve for x
    x = 7,933.13/89.10
  6. Step 6: Final answer
    x = 89.04

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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.