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Finding the Fourth Proportional to 93.02, 139.76 and 90.73

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Solution

The fourth proportional to 93.02, 139.76 and 90.73 is: 136.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.02 : 139.76 = 90.73 : x
  2. Step 2: Convert to fraction form
    93.02/139.76 = 90.73/x
  3. Step 3: Cross multiply
    93.02x = 139.76 × 90.73
  4. Step 4: Simplify right side
    93.02x = 12,680.42
  5. Step 5: Solve for x
    x = 12,680.42/93.02
  6. Step 6: Final answer
    x = 136.32

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.