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Finding the Fourth Proportional to 89.59, 123.64 and 56.85

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Solution

The fourth proportional to 89.59, 123.64 and 56.85 is: 78.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.59 : 123.64 = 56.85 : x
  2. Step 2: Convert to fraction form
    89.59/123.64 = 56.85/x
  3. Step 3: Cross multiply
    89.59x = 123.64 × 56.85
  4. Step 4: Simplify right side
    89.59x = 7,028.93
  5. Step 5: Solve for x
    x = 7,028.93/89.59
  6. Step 6: Final answer
    x = 78.46

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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.