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Finding the Fourth Proportional to 90.11, 123.96 and 79.00

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Solution

The fourth proportional to 90.11, 123.96 and 79.00 is: 108.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.11 : 123.96 = 79.00 : x
  2. Step 2: Convert to fraction form
    90.11/123.96 = 79.00/x
  3. Step 3: Cross multiply
    90.11x = 123.96 × 79.00
  4. Step 4: Simplify right side
    90.11x = 9,792.38
  5. Step 5: Solve for x
    x = 9,792.38/90.11
  6. Step 6: Final answer
    x = 108.67

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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.