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Finding the Fourth Proportional to 64.36, 89.23 and 61.84

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Solution

The fourth proportional to 64.36, 89.23 and 61.84 is: 85.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    64.36 : 89.23 = 61.84 : x
  2. Step 2: Convert to fraction form
    64.36/89.23 = 61.84/x
  3. Step 3: Cross multiply
    64.36x = 89.23 × 61.84
  4. Step 4: Simplify right side
    64.36x = 5,517.98
  5. Step 5: Solve for x
    x = 5,517.98/64.36
  6. Step 6: Final answer
    x = 85.74

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.