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Finding the Fourth Proportional to 90.07, 124.86 and 85.38

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Solution

The fourth proportional to 90.07, 124.86 and 85.38 is: 118.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.07 : 124.86 = 85.38 : x
  2. Step 2: Convert to fraction form
    90.07/124.86 = 85.38/x
  3. Step 3: Cross multiply
    90.07x = 124.86 × 85.38
  4. Step 4: Simplify right side
    90.07x = 10,660.55
  5. Step 5: Solve for x
    x = 10,660.55/90.07
  6. Step 6: Final answer
    x = 118.36

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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.