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Finding the Fourth Proportional to 93.02, 128.09 and 79.80

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Solution

The fourth proportional to 93.02, 128.09 and 79.80 is: 109.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.02 : 128.09 = 79.80 : x
  2. Step 2: Convert to fraction form
    93.02/128.09 = 79.80/x
  3. Step 3: Cross multiply
    93.02x = 128.09 × 79.80
  4. Step 4: Simplify right side
    93.02x = 10,221.18
  5. Step 5: Solve for x
    x = 10,221.18/93.02
  6. Step 6: Final answer
    x = 109.89

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.