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Finding the Fourth Proportional to 153.22, 211.50 and 100.81

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Solution

The fourth proportional to 153.22, 211.50 and 100.81 is: 139.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    153.22 : 211.50 = 100.81 : x
  2. Step 2: Convert to fraction form
    153.22/211.50 = 100.81/x
  3. Step 3: Cross multiply
    153.22x = 211.50 × 100.81
  4. Step 4: Simplify right side
    153.22x = 21,319.75
  5. Step 5: Solve for x
    x = 21,319.75/153.22
  6. Step 6: Final answer
    x = 139.14

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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.