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Finding the Fourth Proportional to 93.98, 128.93 and 91.45

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Solution

The fourth proportional to 93.98, 128.93 and 91.45 is: 125.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.98 : 128.93 = 91.45 : x
  2. Step 2: Convert to fraction form
    93.98/128.93 = 91.45/x
  3. Step 3: Cross multiply
    93.98x = 128.93 × 91.45
  4. Step 4: Simplify right side
    93.98x = 11,790.65
  5. Step 5: Solve for x
    x = 11,790.65/93.98
  6. Step 6: Final answer
    x = 125.46

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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.