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Finding the Fourth Proportional to 93.51, 128.88 and 86.94

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Solution

The fourth proportional to 93.51, 128.88 and 86.94 is: 119.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.51 : 128.88 = 86.94 : x
  2. Step 2: Convert to fraction form
    93.51/128.88 = 86.94/x
  3. Step 3: Cross multiply
    93.51x = 128.88 × 86.94
  4. Step 4: Simplify right side
    93.51x = 11,204.83
  5. Step 5: Solve for x
    x = 11,204.83/93.51
  6. Step 6: Final answer
    x = 119.82

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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.