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Finding the Fourth Proportional to 93.55, 139.34 and 90.20

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Solution

The fourth proportional to 93.55, 139.34 and 90.20 is: 134.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.55 : 139.34 = 90.20 : x
  2. Step 2: Convert to fraction form
    93.55/139.34 = 90.20/x
  3. Step 3: Cross multiply
    93.55x = 139.34 × 90.20
  4. Step 4: Simplify right side
    93.55x = 12,568.47
  5. Step 5: Solve for x
    x = 12,568.47/93.55
  6. Step 6: Final answer
    x = 134.36

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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.