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Finding the Fourth Proportional to 93.78, 140.76 and 63.45

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Solution

The fourth proportional to 93.78, 140.76 and 63.45 is: 95.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.78 : 140.76 = 63.45 : x
  2. Step 2: Convert to fraction form
    93.78/140.76 = 63.45/x
  3. Step 3: Cross multiply
    93.78x = 140.76 × 63.45
  4. Step 4: Simplify right side
    93.78x = 8,931.22
  5. Step 5: Solve for x
    x = 8,931.22/93.78
  6. Step 6: Final answer
    x = 95.24

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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.