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Finding the Fourth Proportional to 85.30, 117.73 and 55.83

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Solution

The fourth proportional to 85.30, 117.73 and 55.83 is: 77.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.30 : 117.73 = 55.83 : x
  2. Step 2: Convert to fraction form
    85.30/117.73 = 55.83/x
  3. Step 3: Cross multiply
    85.30x = 117.73 × 55.83
  4. Step 4: Simplify right side
    85.30x = 6,572.73
  5. Step 5: Solve for x
    x = 6,572.73/85.30
  6. Step 6: Final answer
    x = 77.06

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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.