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Finding the Fourth Proportional to 153.04, 211.13 and 100.61

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Solution

The fourth proportional to 153.04, 211.13 and 100.61 is: 138.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    153.04 : 211.13 = 100.61 : x
  2. Step 2: Convert to fraction form
    153.04/211.13 = 100.61/x
  3. Step 3: Cross multiply
    153.04x = 211.13 × 100.61
  4. Step 4: Simplify right side
    153.04x = 21,241.89
  5. Step 5: Solve for x
    x = 21,241.89/153.04
  6. Step 6: Final answer
    x = 138.80

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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.