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Finding the Fourth Proportional to 153.45, 211.74 and 84.45

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Solution

The fourth proportional to 153.45, 211.74 and 84.45 is: 116.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    153.45 : 211.74 = 84.45 : x
  2. Step 2: Convert to fraction form
    153.45/211.74 = 84.45/x
  3. Step 3: Cross multiply
    153.45x = 211.74 × 84.45
  4. Step 4: Simplify right side
    153.45x = 17,881.44
  5. Step 5: Solve for x
    x = 17,881.44/153.45
  6. Step 6: Final answer
    x = 116.53

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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.