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Finding the Fourth Proportional to 153.36, 211.73 and 109.74

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Solution

The fourth proportional to 153.36, 211.73 and 109.74 is: 151.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    153.36 : 211.73 = 109.74 : x
  2. Step 2: Convert to fraction form
    153.36/211.73 = 109.74/x
  3. Step 3: Cross multiply
    153.36x = 211.73 × 109.74
  4. Step 4: Simplify right side
    153.36x = 23,234.70
  5. Step 5: Solve for x
    x = 23,234.70/153.36
  6. Step 6: Final answer
    x = 151.50

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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.