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Finding the Fourth Proportional to 90.21, 124.50 and 61.11

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Solution

The fourth proportional to 90.21, 124.50 and 61.11 is: 84.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.21 : 124.50 = 61.11 : x
  2. Step 2: Convert to fraction form
    90.21/124.50 = 61.11/x
  3. Step 3: Cross multiply
    90.21x = 124.50 × 61.11
  4. Step 4: Simplify right side
    90.21x = 7,608.20
  5. Step 5: Solve for x
    x = 7,608.20/90.21
  6. Step 6: Final answer
    x = 84.34

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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.