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Finding the Fourth Proportional to 155.65, 215.68 and 153.69

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Solution

The fourth proportional to 155.65, 215.68 and 153.69 is: 212.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    155.65 : 215.68 = 153.69 : x
  2. Step 2: Convert to fraction form
    155.65/215.68 = 153.69/x
  3. Step 3: Cross multiply
    155.65x = 215.68 × 153.69
  4. Step 4: Simplify right side
    155.65x = 33,147.86
  5. Step 5: Solve for x
    x = 33,147.86/155.65
  6. Step 6: Final answer
    x = 212.96

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.