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Finding the Fourth Proportional to 153.31, 211.66 and 117.80

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Solution

The fourth proportional to 153.31, 211.66 and 117.80 is: 162.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    153.31 : 211.66 = 117.80 : x
  2. Step 2: Convert to fraction form
    153.31/211.66 = 117.80/x
  3. Step 3: Cross multiply
    153.31x = 211.66 × 117.80
  4. Step 4: Simplify right side
    153.31x = 24,932.72
  5. Step 5: Solve for x
    x = 24,932.72/153.31
  6. Step 6: Final answer
    x = 162.63

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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.