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Finding the Fourth Proportional to 153.21, 211.39 and 91.02

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Solution

The fourth proportional to 153.21, 211.39 and 91.02 is: 125.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    153.21 : 211.39 = 91.02 : x
  2. Step 2: Convert to fraction form
    153.21/211.39 = 91.02/x
  3. Step 3: Cross multiply
    153.21x = 211.39 × 91.02
  4. Step 4: Simplify right side
    153.21x = 19,240.72
  5. Step 5: Solve for x
    x = 19,240.72/153.21
  6. Step 6: Final answer
    x = 125.58

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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.