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Finding the Fourth Proportional to 93.30, 128.60 and 65.70

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Solution

The fourth proportional to 93.30, 128.60 and 65.70 is: 90.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.30 : 128.60 = 65.70 : x
  2. Step 2: Convert to fraction form
    93.30/128.60 = 65.70/x
  3. Step 3: Cross multiply
    93.30x = 128.60 × 65.70
  4. Step 4: Simplify right side
    93.30x = 8,449.02
  5. Step 5: Solve for x
    x = 8,449.02/93.30
  6. Step 6: Final answer
    x = 90.56

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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.