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Finding the Fourth Proportional to 85.40, 128.03 and 46.83

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Solution

The fourth proportional to 85.40, 128.03 and 46.83 is: 70.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.40 : 128.03 = 46.83 : x
  2. Step 2: Convert to fraction form
    85.40/128.03 = 46.83/x
  3. Step 3: Cross multiply
    85.40x = 128.03 × 46.83
  4. Step 4: Simplify right side
    85.40x = 5,995.73
  5. Step 5: Solve for x
    x = 5,995.73/85.40
  6. Step 6: Final answer
    x = 70.21

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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.