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Finding the Fourth Proportional to 93.52, 128.30 and 90.80

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Solution

The fourth proportional to 93.52, 128.30 and 90.80 is: 124.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.52 : 128.30 = 90.80 : x
  2. Step 2: Convert to fraction form
    93.52/128.30 = 90.80/x
  3. Step 3: Cross multiply
    93.52x = 128.30 × 90.80
  4. Step 4: Simplify right side
    93.52x = 11,649.64
  5. Step 5: Solve for x
    x = 11,649.64/93.52
  6. Step 6: Final answer
    x = 124.57

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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.