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Finding the Fourth Proportional to 93.42, 127.80 and 91.80

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Solution

The fourth proportional to 93.42, 127.80 and 91.80 is: 125.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.42 : 127.80 = 91.80 : x
  2. Step 2: Convert to fraction form
    93.42/127.80 = 91.80/x
  3. Step 3: Cross multiply
    93.42x = 127.80 × 91.80
  4. Step 4: Simplify right side
    93.42x = 11,732.04
  5. Step 5: Solve for x
    x = 11,732.04/93.42
  6. Step 6: Final answer
    x = 125.58

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.