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Finding the Fourth Proportional to 90.23, 124.40 and 85.22

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Solution

The fourth proportional to 90.23, 124.40 and 85.22 is: 117.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.23 : 124.40 = 85.22 : x
  2. Step 2: Convert to fraction form
    90.23/124.40 = 85.22/x
  3. Step 3: Cross multiply
    90.23x = 124.40 × 85.22
  4. Step 4: Simplify right side
    90.23x = 10,600.32
  5. Step 5: Solve for x
    x = 10,600.32/90.23
  6. Step 6: Final answer
    x = 117.49

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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.