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Finding the Fourth Proportional to 153.07, 211.23 and 86.68

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Solution

The fourth proportional to 153.07, 211.23 and 86.68 is: 119.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    153.07 : 211.23 = 86.68 : x
  2. Step 2: Convert to fraction form
    153.07/211.23 = 86.68/x
  3. Step 3: Cross multiply
    153.07x = 211.23 × 86.68
  4. Step 4: Simplify right side
    153.07x = 18,308.89
  5. Step 5: Solve for x
    x = 18,308.89/153.07
  6. Step 6: Final answer
    x = 119.61

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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.