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Finding the Fourth Proportional to 153.21, 211.16 and 135.51

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Solution

The fourth proportional to 153.21, 211.16 and 135.51 is: 186.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    153.21 : 211.16 = 135.51 : x
  2. Step 2: Convert to fraction form
    153.21/211.16 = 135.51/x
  3. Step 3: Cross multiply
    153.21x = 211.16 × 135.51
  4. Step 4: Simplify right side
    153.21x = 28,613.61
  5. Step 5: Solve for x
    x = 28,613.61/153.21
  6. Step 6: Final answer
    x = 186.76

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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.