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Finding the Fourth Proportional to 93.42, 139.41 and 90

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Solution

The fourth proportional to 93.42, 139.41 and 90 is: 134.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.42 : 139.41 = 90 : x
  2. Step 2: Convert to fraction form
    93.42/139.41 = 90/x
  3. Step 3: Cross multiply
    93.42x = 139.41 × 90
  4. Step 4: Simplify right side
    93.42x = 12,546.90
  5. Step 5: Solve for x
    x = 12,546.90/93.42
  6. Step 6: Final answer
    x = 134.31

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.