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Finding the Fourth Proportional to 93.18, 139.02 and 89.68

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Solution

The fourth proportional to 93.18, 139.02 and 89.68 is: 133.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.18 : 139.02 = 89.68 : x
  2. Step 2: Convert to fraction form
    93.18/139.02 = 89.68/x
  3. Step 3: Cross multiply
    93.18x = 139.02 × 89.68
  4. Step 4: Simplify right side
    93.18x = 12,467.31
  5. Step 5: Solve for x
    x = 12,467.31/93.18
  6. Step 6: Final answer
    x = 133.80

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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.