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Finding the Fourth Proportional to 89.50, 133.58 and 83.74

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Solution

The fourth proportional to 89.50, 133.58 and 83.74 is: 124.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.50 : 133.58 = 83.74 : x
  2. Step 2: Convert to fraction form
    89.50/133.58 = 83.74/x
  3. Step 3: Cross multiply
    89.50x = 133.58 × 83.74
  4. Step 4: Simplify right side
    89.50x = 11,185.99
  5. Step 5: Solve for x
    x = 11,185.99/89.50
  6. Step 6: Final answer
    x = 124.98

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.