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Finding the Fourth Proportional to 90.33, 124.83 and 78.03

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Solution

The fourth proportional to 90.33, 124.83 and 78.03 is: 107.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.33 : 124.83 = 78.03 : x
  2. Step 2: Convert to fraction form
    90.33/124.83 = 78.03/x
  3. Step 3: Cross multiply
    90.33x = 124.83 × 78.03
  4. Step 4: Simplify right side
    90.33x = 9,740.48
  5. Step 5: Solve for x
    x = 9,740.48/90.33
  6. Step 6: Final answer
    x = 107.83

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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.