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Finding the Fourth Proportional to 153.09, 211.21 and 90.92

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Solution

The fourth proportional to 153.09, 211.21 and 90.92 is: 125.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    153.09 : 211.21 = 90.92 : x
  2. Step 2: Convert to fraction form
    153.09/211.21 = 90.92/x
  3. Step 3: Cross multiply
    153.09x = 211.21 × 90.92
  4. Step 4: Simplify right side
    153.09x = 19,203.51
  5. Step 5: Solve for x
    x = 19,203.51/153.09
  6. Step 6: Final answer
    x = 125.44

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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.