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Finding the Fourth Proportional to 93.12, 129.21 and 90.90

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Solution

The fourth proportional to 93.12, 129.21 and 90.90 is: 126.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.12 : 129.21 = 90.90 : x
  2. Step 2: Convert to fraction form
    93.12/129.21 = 90.90/x
  3. Step 3: Cross multiply
    93.12x = 129.21 × 90.90
  4. Step 4: Simplify right side
    93.12x = 11,745.19
  5. Step 5: Solve for x
    x = 11,745.19/93.12
  6. Step 6: Final answer
    x = 126.13

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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.