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Finding the Fourth Proportional to 93.06, 128.40 and 55.71

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Solution

The fourth proportional to 93.06, 128.40 and 55.71 is: 76.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.06 : 128.40 = 55.71 : x
  2. Step 2: Convert to fraction form
    93.06/128.40 = 55.71/x
  3. Step 3: Cross multiply
    93.06x = 128.40 × 55.71
  4. Step 4: Simplify right side
    93.06x = 7,153.16
  5. Step 5: Solve for x
    x = 7,153.16/93.06
  6. Step 6: Final answer
    x = 76.87

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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.