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Finding the Fourth Proportional to 112.85, 155.73 and 65.59

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Solution

The fourth proportional to 112.85, 155.73 and 65.59 is: 90.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.85 : 155.73 = 65.59 : x
  2. Step 2: Convert to fraction form
    112.85/155.73 = 65.59/x
  3. Step 3: Cross multiply
    112.85x = 155.73 × 65.59
  4. Step 4: Simplify right side
    112.85x = 10,214.33
  5. Step 5: Solve for x
    x = 10,214.33/112.85
  6. Step 6: Final answer
    x = 90.51

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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.