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Finding the Fourth Proportional to 93.34, 139.90 and 78.82

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Solution

The fourth proportional to 93.34, 139.90 and 78.82 is: 118.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.34 : 139.90 = 78.82 : x
  2. Step 2: Convert to fraction form
    93.34/139.90 = 78.82/x
  3. Step 3: Cross multiply
    93.34x = 139.90 × 78.82
  4. Step 4: Simplify right side
    93.34x = 11,026.92
  5. Step 5: Solve for x
    x = 11,026.92/93.34
  6. Step 6: Final answer
    x = 118.14

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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.