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Finding the Fourth Proportional to 85.03, 126.71 and 84.32

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Solution

The fourth proportional to 85.03, 126.71 and 84.32 is: 125.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.03 : 126.71 = 84.32 : x
  2. Step 2: Convert to fraction form
    85.03/126.71 = 84.32/x
  3. Step 3: Cross multiply
    85.03x = 126.71 × 84.32
  4. Step 4: Simplify right side
    85.03x = 10,684.19
  5. Step 5: Solve for x
    x = 10,684.19/85.03
  6. Step 6: Final answer
    x = 125.65

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.