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Finding the Fourth Proportional to 89.44, 123.32 and 56.64

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Solution

The fourth proportional to 89.44, 123.32 and 56.64 is: 78.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.44 : 123.32 = 56.64 : x
  2. Step 2: Convert to fraction form
    89.44/123.32 = 56.64/x
  3. Step 3: Cross multiply
    89.44x = 123.32 × 56.64
  4. Step 4: Simplify right side
    89.44x = 6,984.84
  5. Step 5: Solve for x
    x = 6,984.84/89.44
  6. Step 6: Final answer
    x = 78.10

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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.