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Finding the Fourth Proportional to 93.66, 139.68 and 79.98

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Solution

The fourth proportional to 93.66, 139.68 and 79.98 is: 119.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.66 : 139.68 = 79.98 : x
  2. Step 2: Convert to fraction form
    93.66/139.68 = 79.98/x
  3. Step 3: Cross multiply
    93.66x = 139.68 × 79.98
  4. Step 4: Simplify right side
    93.66x = 11,171.61
  5. Step 5: Solve for x
    x = 11,171.61/93.66
  6. Step 6: Final answer
    x = 119.28

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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.