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Finding the Fourth Proportional to 93.21, 139.29 and 90.15

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Solution

The fourth proportional to 93.21, 139.29 and 90.15 is: 134.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.21 : 139.29 = 90.15 : x
  2. Step 2: Convert to fraction form
    93.21/139.29 = 90.15/x
  3. Step 3: Cross multiply
    93.21x = 139.29 × 90.15
  4. Step 4: Simplify right side
    93.21x = 12,556.99
  5. Step 5: Solve for x
    x = 12,556.99/93.21
  6. Step 6: Final answer
    x = 134.72

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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.