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Finding the Fourth Proportional to 153.09, 211.26 and 86.70

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Solution

The fourth proportional to 153.09, 211.26 and 86.70 is: 119.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    153.09 : 211.26 = 86.70 : x
  2. Step 2: Convert to fraction form
    153.09/211.26 = 86.70/x
  3. Step 3: Cross multiply
    153.09x = 211.26 × 86.70
  4. Step 4: Simplify right side
    153.09x = 18,316.24
  5. Step 5: Solve for x
    x = 18,316.24/153.09
  6. Step 6: Final answer
    x = 119.64

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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.