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Finding the Fourth Proportional to 93.76, 139.67 and 90.49

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Solution

The fourth proportional to 93.76, 139.67 and 90.49 is: 134.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.76 : 139.67 = 90.49 : x
  2. Step 2: Convert to fraction form
    93.76/139.67 = 90.49/x
  3. Step 3: Cross multiply
    93.76x = 139.67 × 90.49
  4. Step 4: Simplify right side
    93.76x = 12,639.05
  5. Step 5: Solve for x
    x = 12,639.05/93.76
  6. Step 6: Final answer
    x = 134.81

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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.