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Finding the Fourth Proportional to 85.43, 128.00 and 73.35

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Solution

The fourth proportional to 85.43, 128.00 and 73.35 is: 109.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.43 : 128.00 = 73.35 : x
  2. Step 2: Convert to fraction form
    85.43/128.00 = 73.35/x
  3. Step 3: Cross multiply
    85.43x = 128.00 × 73.35
  4. Step 4: Simplify right side
    85.43x = 9,388.98
  5. Step 5: Solve for x
    x = 9,388.98/85.43
  6. Step 6: Final answer
    x = 109.90

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.