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Finding the Fourth Proportional to 155.15, 214.99 and 153.19

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Solution

The fourth proportional to 155.15, 214.99 and 153.19 is: 212.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    155.15 : 214.99 = 153.19 : x
  2. Step 2: Convert to fraction form
    155.15/214.99 = 153.19/x
  3. Step 3: Cross multiply
    155.15x = 214.99 × 153.19
  4. Step 4: Simplify right side
    155.15x = 32,934.20
  5. Step 5: Solve for x
    x = 32,934.20/155.15
  6. Step 6: Final answer
    x = 212.28

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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.