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Finding the Fourth Proportional to 85.59, 128.30 and 73.62

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Solution

The fourth proportional to 85.59, 128.30 and 73.62 is: 110.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.59 : 128.30 = 73.62 : x
  2. Step 2: Convert to fraction form
    85.59/128.30 = 73.62/x
  3. Step 3: Cross multiply
    85.59x = 128.30 × 73.62
  4. Step 4: Simplify right side
    85.59x = 9,445.08
  5. Step 5: Solve for x
    x = 9,445.08/85.59
  6. Step 6: Final answer
    x = 110.35

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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.