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Finding the Fourth Proportional to 155.70, 233.55 and 90.72

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Solution

The fourth proportional to 155.70, 233.55 and 90.72 is: 136.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    155.70 : 233.55 = 90.72 : x
  2. Step 2: Convert to fraction form
    155.70/233.55 = 90.72/x
  3. Step 3: Cross multiply
    155.70x = 233.55 × 90.72
  4. Step 4: Simplify right side
    155.70x = 21,187.66
  5. Step 5: Solve for x
    x = 21,187.66/155.70
  6. Step 6: Final answer
    x = 136.08

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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.