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Finding the Fourth Proportional to 155.90, 233.60 and 90.75

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Solution

The fourth proportional to 155.90, 233.60 and 90.75 is: 135.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    155.90 : 233.60 = 90.75 : x
  2. Step 2: Convert to fraction form
    155.90/233.60 = 90.75/x
  3. Step 3: Cross multiply
    155.90x = 233.60 × 90.75
  4. Step 4: Simplify right side
    155.90x = 21,198.75
  5. Step 5: Solve for x
    x = 21,198.75/155.90
  6. Step 6: Final answer
    x = 135.98

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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.